diff --git a/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App.Installers/FirstAppInstanceCallerInitializer.cs b/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App.Installers/FirstAppInstanceCallerInitializer.cs
index e11ef1f20..a716a0d58 100644
--- a/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App.Installers/FirstAppInstanceCallerInitializer.cs
+++ b/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App.Installers/FirstAppInstanceCallerInitializer.cs
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Proton Technologies AG
+ * Copyright (c) 2023 Proton AG
  *
  * This file is part of ProtonVPN.
  *
diff --git a/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/AppGrpcClient.cs b/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/AppGrpcClient.cs
index b9eb82eac..dd6683019 100644
--- a/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/AppGrpcClient.cs
+++ b/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/AppGrpcClient.cs
@@ -85,12 +85,25 @@ private async Task CreateInternalAsync()
             int? appServerPort = _grpcServer?.Port;
             if (VpnController is not null && appServerPort is not null)
             {
-                Logger.Info<ProcessCommunicationLog>($"Sending app gRPC server port {appServerPort.Value} to service.");
+                await RegisterStateConsumerAsync(appServerPort.Value);
+            }
+        }
+
+        private async Task RegisterStateConsumerAsync(int appServerPort)
+        {
+            Logger.Info<ProcessCommunicationLog>($"Sending the app gRPC server port {appServerPort} to service.");
+            try
+            {
                 await VpnController.RegisterStateConsumer(new StateConsumerIpcEntity
                 {
-                    ServerPort = appServerPort.Value
+                    ServerPort = appServerPort
                 });
             }
+            catch (Exception e)
+            {
+                Logger.Error<ProcessCommunicationErrorLog>($"An error occurred when " +
+                    $"sending the app gRPC server port {appServerPort} to service.", e);
+            }
         }
 
         public async Task RecreateAsync()
diff --git a/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/FirstAppInstanceCaller.cs b/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/FirstAppInstanceCaller.cs
index 1bdabd9f4..347f1ab95 100644
--- a/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/FirstAppInstanceCaller.cs
+++ b/src/ProcessCommunication/App/ProtonVPN.ProcessCommunication.App/FirstAppInstanceCaller.cs
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Proton Technologies AG
+ * Copyright (c) 2023 Proton AG
  *
  * This file is part of ProtonVPN.
  *
@@ -32,11 +32,33 @@ public static async Task OpenMainWindowAsync()
             int? appServerPort = appServerPortRegister.ReadOnce();
             if (appServerPort.HasValue && GrpcChannelWrapperFactory.IsPortValid(appServerPort.Value))
             {
-                GrpcChannelWrapper grpcChannelWrapper = new(appServerPort.Value);
+                await CreateGrpcChannelAndSendOpenWindowCommandAsync(appServerPort.Value);
+            }
+        }
+
+        private static async Task CreateGrpcChannelAndSendOpenWindowCommandAsync(int appServerPort)
+        {
+            try
+            {
+                GrpcChannelWrapper grpcChannelWrapper = new(appServerPort);
                 IAppController appController = grpcChannelWrapper.CreateService<IAppController>();
-                await appController.OpenWindow();
+                await SendOpenWindowCommandAsync(appController);
                 await grpcChannelWrapper.ShutdownAsync();
             }
+            catch
+            {
+            }
+        }
+
+        private static async Task SendOpenWindowCommandAsync(IAppController appController)
+        {
+            try
+            {
+                await appController.OpenWindow();
+            }
+            catch
+            {
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/src/ProtonVPN.App/Core/AppSettings.cs b/src/ProtonVPN.App/Core/AppSettings.cs
index b8048445d..59ea05d25 100644
--- a/src/ProtonVPN.App/Core/AppSettings.cs
+++ b/src/ProtonVPN.App/Core/AppSettings.cs
@@ -28,6 +28,7 @@
 using ProtonVPN.Announcements.Contracts;
 using ProtonVPN.Api.Contracts.ReportAnIssue;
 using ProtonVPN.Common;
+using ProtonVPN.Common.Collections.Concurrent;
 using ProtonVPN.Common.Configuration;
 using ProtonVPN.Common.Extensions;
 using ProtonVPN.Common.KillSwitch;
@@ -53,7 +54,7 @@ internal class AppSettings : IAppSettings, INotifyPropertyChanged, ILoggedInAwar
         private readonly ISettingsStorage _storage;
         private readonly UserSettings _userSettings;
         private readonly IConfiguration _config;
-        private readonly HashSet<string> _accessedPerUserProperties = new();
+        private readonly ConcurrentHashSet<string> _accessedPerUserProperties = new();
 
         public AppSettings(ILogger logger,
             ISettingsStorage storage, 
@@ -695,21 +696,21 @@ private void LogChange<T>(string propertyName, T oldValue, T newValue)
 
         private T GetPerUser<T>([CallerMemberName] string propertyName = null)
         {
-            _accessedPerUserProperties.Add(propertyName);
+            _accessedPerUserProperties.TryAdd(propertyName);
 
             return _userSettings.Get<T>(propertyName);
         }
 
         private string GetPerUserDecrypted([CallerMemberName] string propertyName = null)
         {
-            _accessedPerUserProperties.Add(propertyName);
+            _accessedPerUserProperties.TryAdd(propertyName);
 
             return _userSettings.Get<string>(propertyName)?.Decrypt();
         }
 
         private void SetPerUserInner<T>(T value, string propertyName)
         {
-            _accessedPerUserProperties.Add(propertyName);
+            _accessedPerUserProperties.TryAdd(propertyName);
 
             T oldValue = default;
             Type toType = UnwrapNullable(typeof(T));
diff --git a/src/ProtonVPN.App/Core/Service/ServiceControllerCaller.cs b/src/ProtonVPN.App/Core/Service/ServiceControllerCaller.cs
index d9987dbf3..4a60fc8ac 100644
--- a/src/ProtonVPN.App/Core/Service/ServiceControllerCaller.cs
+++ b/src/ProtonVPN.App/Core/Service/ServiceControllerCaller.cs
@@ -20,6 +20,8 @@
 using System;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
+using ProtonVPN.Common.Abstract;
+using ProtonVPN.Common.Extensions;
 using ProtonVPN.Common.Logging;
 using ProtonVPN.Common.Logging.Categorization.Events.AppServiceLogs;
 using ProtonVPN.ProcessCommunication.Contracts;
@@ -40,7 +42,7 @@ protected ServiceControllerCaller(ILogger logger, IAppGrpcClient grpcClient, Vpn
             _vpnSystemService = vpnSystemService;
         }
 
-        protected async Task<T> Invoke<T>(Func<Controller, Task<T>> serviceCall,
+        protected async Task<Result<T>> Invoke<T>(Func<Controller, Task<T>> serviceCall,
             [CallerMemberName] string memberName = "")
         {
             int retryCount = 5;
@@ -56,7 +58,7 @@ protected async Task<T> Invoke<T>(Func<Controller, Task<T>> serviceCall,
                         await task;
                     }
 
-                    return result;
+                    return Result.Ok(result);
                 }
                 catch (Exception e)
                 {
@@ -64,7 +66,7 @@ protected async Task<T> Invoke<T>(Func<Controller, Task<T>> serviceCall,
                     if (retryCount <= 0)
                     {
                         LogError(e, memberName, isToRetry: false);
-                        throw;
+                        return Result.Fail<T>(e.CombinedMessage());
                     }
 
                     await _grpcClient.RecreateAsync();
diff --git a/src/ProtonVPN.App/Core/Service/Update/UpdateServiceCaller.cs b/src/ProtonVPN.App/Core/Service/Update/UpdateServiceCaller.cs
index 299e7f2e5..77bd65661 100644
--- a/src/ProtonVPN.App/Core/Service/Update/UpdateServiceCaller.cs
+++ b/src/ProtonVPN.App/Core/Service/Update/UpdateServiceCaller.cs
@@ -28,8 +28,8 @@ namespace ProtonVPN.Core.Service.Update
 {
     public class UpdateServiceCaller : ServiceControllerCaller<IUpdateController>
     {
-        public UpdateServiceCaller(ILogger logger, IAppGrpcClient grpcClient, VpnSystemService vpnSystemService) : base(
-            logger, grpcClient, vpnSystemService)
+        public UpdateServiceCaller(ILogger logger, IAppGrpcClient grpcClient, VpnSystemService vpnSystemService) 
+            : base(logger, grpcClient, vpnSystemService)
         {
         }
 
diff --git a/src/ProtonVPN.App/Core/Service/Vpn/VpnConnectionSpeed.cs b/src/ProtonVPN.App/Core/Service/Vpn/VpnConnectionSpeed.cs
index 26ed953ed..6a28b1807 100644
--- a/src/ProtonVPN.App/Core/Service/Vpn/VpnConnectionSpeed.cs
+++ b/src/ProtonVPN.App/Core/Service/Vpn/VpnConnectionSpeed.cs
@@ -83,18 +83,7 @@ private async void UpdateSpeed(object sender, EventArgs e)
             InOutBytes total;
             using (await _lock.Lock())
             {
-                try
-                {
-                    total = await _vpnServiceManager.Total();
-                }
-                catch (CommunicationException)
-                {
-                    return;
-                }
-                catch (TimeoutException)
-                {
-                    return;
-                }
+                total = await _vpnServiceManager.GetTrafficBytes();
             }
 
             _speed = total - _total;
diff --git a/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceActionDecorator.cs b/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceActionDecorator.cs
index 91c3cfbba..da9cd0cc0 100644
--- a/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceActionDecorator.cs
+++ b/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceActionDecorator.cs
@@ -80,9 +80,9 @@ await InvokeAction(async () =>
             });
         }
 
-        public async Task<InOutBytes> Total()
+        public async Task<InOutBytes> GetTrafficBytes()
         {
-            return await _decorated.Total();
+            return await _decorated.GetTrafficBytes();
         }
 
         public async Task RepeatState()
diff --git a/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceCaller.cs b/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceCaller.cs
index 76ecc931e..2a1a8029e 100644
--- a/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceCaller.cs
+++ b/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceCaller.cs
@@ -18,6 +18,7 @@
  */
 
 using System.Threading.Tasks;
+using ProtonVPN.Common.Abstract;
 using ProtonVPN.Common.Extensions;
 using ProtonVPN.Common.Logging;
 using ProtonVPN.ProcessCommunication.Contracts;
@@ -31,8 +32,8 @@ namespace ProtonVPN.Core.Service.Vpn
 {
     public class VpnServiceCaller : ServiceControllerCaller<IVpnController>
     {
-        public VpnServiceCaller(ILogger logger, IAppGrpcClient grpcClient, VpnSystemService vpnSystemService) : base(
-            logger, grpcClient, vpnSystemService)
+        public VpnServiceCaller(ILogger logger, IAppGrpcClient grpcClient, VpnSystemService vpnSystemService) 
+            : base(logger, grpcClient, vpnSystemService)
         {
         }
 
@@ -61,7 +62,7 @@ public Task RepeatState()
             return Invoke(c => c.RepeatState().Wrap());
         }
 
-        public Task<TrafficBytesIpcEntity> Total()
+        public Task<Result<TrafficBytesIpcEntity>> GetTrafficBytes()
         {
             return Invoke(c => c.GetTrafficBytes());
         }
@@ -71,7 +72,6 @@ public Task RequestNetShieldStats()
             return Invoke(c => c.RequestNetShieldStats().Wrap());
         }
 
-
         public Task RegisterVpnClient(int port)
         {
             return Invoke(c => c.RegisterStateConsumer(new StateConsumerIpcEntity { ServerPort = port }).Wrap());
diff --git a/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceManager.cs b/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceManager.cs
index 899126c5d..e1379589a 100644
--- a/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceManager.cs
+++ b/src/ProtonVPN.App/Core/Service/Vpn/VpnServiceManager.cs
@@ -20,7 +20,7 @@
 using System;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
-using System.Windows;
+using ProtonVPN.Common.Abstract;
 using ProtonVPN.Common.Helpers;
 using ProtonVPN.Common.Logging;
 using ProtonVPN.Common.Logging.Categorization.Events.DisconnectLogs;
@@ -118,9 +118,12 @@ public async Task UpdateAuthCertificate(string certificate)
             await _vpnServiceCaller.UpdateAuthCertificate(new AuthCertificateIpcEntity() { Certificate = certificate });
         }
 
-        public async Task<InOutBytes> Total()
+        public async Task<InOutBytes> GetTrafficBytes()
         {
-            return _entityMapper.Map<TrafficBytesIpcEntity, InOutBytes>(await _vpnServiceCaller.Total());
+            Result<TrafficBytesIpcEntity> trafficBytes = await _vpnServiceCaller.GetTrafficBytes();
+            return trafficBytes.Success
+                ? _entityMapper.Map<TrafficBytesIpcEntity, InOutBytes>(trafficBytes.Value)
+                : InOutBytes.Zero;
         }
 
         public async Task RepeatState()
diff --git a/src/ProtonVPN.App/Windows/IOpenMainWindowAware.cs b/src/ProtonVPN.App/Windows/IOpenMainWindowAware.cs
index 444d63b1a..5101aa7bc 100644
--- a/src/ProtonVPN.App/Windows/IOpenMainWindowAware.cs
+++ b/src/ProtonVPN.App/Windows/IOpenMainWindowAware.cs
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Proton Technologies AG
+ * Copyright (c) 2023 Proton AG
  *
  * This file is part of ProtonVPN.
  *
diff --git a/src/ProtonVPN.Common/Collections/Concurrent/ConcurrentHashSet.cs b/src/ProtonVPN.Common/Collections/Concurrent/ConcurrentHashSet.cs
new file mode 100644
index 000000000..9bdda04b4
--- /dev/null
+++ b/src/ProtonVPN.Common/Collections/Concurrent/ConcurrentHashSet.cs
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2023 Proton AG
+ *
+ * This file is part of ProtonVPN.
+ *
+ * ProtonVPN is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ProtonVPN is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ProtonVPN.Common.Collections.Concurrent
+{
+    public class ConcurrentHashSet<T>
+    {
+        private readonly ConcurrentDictionary<T, bool> _dictionary = new();
+
+        public bool TryAdd(T item)
+        {
+            return _dictionary.TryAdd(item, true);
+        }
+
+        public List<T> ToList()
+        {
+            return _dictionary.Keys.ToList();
+        }
+
+        public void Clear()
+        {
+            _dictionary.Clear();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/ProtonVPN.Common/Logging/NullLogger.cs b/src/ProtonVPN.Common/Logging/NullLogger.cs
index ff7dc2852..20c1b5760 100644
--- a/src/ProtonVPN.Common/Logging/NullLogger.cs
+++ b/src/ProtonVPN.Common/Logging/NullLogger.cs
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Proton Technologies AG
+ * Copyright (c) 2023 Proton AG
  *
  * This file is part of ProtonVPN.
  *
diff --git a/src/ProtonVPN.Core/Vpn/IVpnServiceManager.cs b/src/ProtonVPN.Core/Vpn/IVpnServiceManager.cs
index e03637b47..526954d6e 100644
--- a/src/ProtonVPN.Core/Vpn/IVpnServiceManager.cs
+++ b/src/ProtonVPN.Core/Vpn/IVpnServiceManager.cs
@@ -34,7 +34,7 @@ Task Disconnect(VpnError vpnError,
             [CallerFilePath] string sourceFilePath = "",
             [CallerMemberName] string sourceMemberName = "",
             [CallerLineNumber] int sourceLineNumber = 0);
-        Task<InOutBytes> Total();
+        Task<InOutBytes> GetTrafficBytes();
         Task RepeatState();
 
         void RegisterVpnStateCallback(Action<VpnStateChangedEventArgs> callback);