diff --git a/frontend/dashboard/index.tsx b/frontend/dashboard/index.tsx
index a476ceb711f..e71b69995ff 100644
--- a/frontend/dashboard/index.tsx
+++ b/frontend/dashboard/index.tsx
@@ -8,7 +8,7 @@ import { initReactI18next } from 'react-i18next';
 import nb from '../language/src/nb.json';
 import en from '../language/src/en.json';
 import { DEFAULT_LANGUAGE } from 'app-shared/constants';
-import { QueryClient } from '@tanstack/react-query';
+import { QueryClientConfig } from '@tanstack/react-query';
 import { ServicesContextProvider } from 'app-shared/contexts/ServicesContext';
 import * as queries from 'app-shared/api/queries';
 import * as mutations from 'app-shared/api/mutations';
@@ -26,18 +26,18 @@ i18next.use(initReactI18next).init({
 const container = document.getElementById('root');
 const root = createRoot(container);
 
-const queryClient = new QueryClient({
+const queryClientConfig: QueryClientConfig = {
   defaultOptions: {
     queries: {
       retry: false,
       refetchOnWindowFocus: false,
     },
   },
-});
+};
 
 root.render(
   <BrowserRouter basename={DASHBOARD_BASENAME}>
-    <ServicesContextProvider client={queryClient} {...queries} {...mutations}>
+    <ServicesContextProvider clientConfig={queryClientConfig} {...queries} {...mutations}>
       <App />
     </ServicesContextProvider>
   </BrowserRouter>
diff --git a/frontend/language/src/en.json b/frontend/language/src/en.json
index 2044845b8ac..d938ee97745 100644
--- a/frontend/language/src/en.json
+++ b/frontend/language/src/en.json
@@ -242,6 +242,7 @@
   "general.disabled": "Disabled",
   "general.edit": "Edit",
   "general.enabled": "Enabled",
+  "general.error_message": "An error has occurred! If the problem persists, contact us on <a href=\"https://altinn.slack.com\">Slack</a>.",
   "general.error_message_with_colon": "Error message:",
   "general.fetch_error_message": "Failed to load required data for this page. Please reload the page to try again",
   "general.fetch_error_title": "An error occurred while loading",
@@ -270,6 +271,7 @@
   "general.sign_out": "Sign out",
   "general.submit": "Submit",
   "general.text": "Text",
+  "general.try_again": "Try again",
   "general.unknown_error": "Unknown error ocurred while loading data.",
   "general.validate_changes": "Validate changes",
   "general.value": "Value",
diff --git a/frontend/language/src/nb.json b/frontend/language/src/nb.json
index 4a529e892c4..0f2e2a87591 100644
--- a/frontend/language/src/nb.json
+++ b/frontend/language/src/nb.json
@@ -267,6 +267,7 @@
   "general.disabled": "Deaktivert",
   "general.edit": "Endre",
   "general.enabled": "Aktivert",
+  "general.error_message": "Det har oppstått en feil! Om problemet vedvarer, ta kontakt med oss på <a href=\"https://altinn.slack.com\">Slack</a>.",
   "general.error_message_with_colon": "Feilmelding:",
   "general.fetch_error_message": "Kunne ikke laste inn nødvendig data for denne siden. Last siden på nytt for å prøve igjen.",
   "general.fetch_error_title": "En feil oppstod ved innlasting av",
@@ -296,6 +297,7 @@
   "general.sign_out": "Logg ut",
   "general.submit": "Send inn",
   "general.text": "Tekst",
+  "general.try_again": "Prøv igjen",
   "general.unknown_error": "Ukjent feil oppstod ved innlasting av data.",
   "general.validate_changes": "Valider endringer",
   "general.value": "Verdi",
diff --git a/frontend/packages/shared/src/components/ErrorBoundaryFallback.module.css b/frontend/packages/shared/src/components/ErrorBoundaryFallback.module.css
new file mode 100644
index 00000000000..db98c0f780d
--- /dev/null
+++ b/frontend/packages/shared/src/components/ErrorBoundaryFallback.module.css
@@ -0,0 +1,9 @@
+.container {
+  padding: var(--fds-spacing-10);
+  width: auto;
+}
+
+.alert > [class*='Alert-module_content'] {
+  display: flex;
+  gap: 1rem;
+}
diff --git a/frontend/packages/shared/src/components/ErrorBoundaryFallback.tsx b/frontend/packages/shared/src/components/ErrorBoundaryFallback.tsx
new file mode 100644
index 00000000000..a3113656dbf
--- /dev/null
+++ b/frontend/packages/shared/src/components/ErrorBoundaryFallback.tsx
@@ -0,0 +1,29 @@
+import React from 'react';
+import { useErrorBoundary } from 'react-error-boundary';
+import { useTranslation } from 'react-i18next';
+import { _useIsProdHack } from 'app-shared/utils/_useIsProdHack';
+import { Trans } from 'react-i18next';
+import { Alert, Button, ErrorMessage, Link, Paragraph } from '@digdir/design-system-react';
+import { Center } from './Center';
+import classes from './ErrorBoundaryFallback.module.css';
+
+export type ErrorBoundaryFallbackProps = {
+  error: Error;
+}
+
+export const ErrorBoundaryFallback = ({ error }: ErrorBoundaryFallbackProps) => {
+  const { t } = useTranslation();
+  const { resetBoundary } = useErrorBoundary();
+
+  return (
+    <Center className={classes.container}>
+      <Alert severity='danger' className={classes.alert}>
+        <Paragraph><Trans i18nKey={'general.error_message'} components={{ a: <Link>Slack</Link> }}/></Paragraph>
+        {!_useIsProdHack && <ErrorMessage>{error.message}</ErrorMessage>}
+        <Center>
+          <Button onClick={resetBoundary} size='small'>{t('general.try_again')}</Button>
+        </Center>
+      </Alert>
+    </Center>
+  );
+};
diff --git a/frontend/packages/shared/src/contexts/ServicesContext.test.tsx b/frontend/packages/shared/src/contexts/ServicesContext.test.tsx
new file mode 100644
index 00000000000..d2c2c2b2c38
--- /dev/null
+++ b/frontend/packages/shared/src/contexts/ServicesContext.test.tsx
@@ -0,0 +1,35 @@
+import React from 'react';
+import { render, renderHook, screen, waitFor } from '@testing-library/react';
+import { ServicesContextProvider } from './ServicesContext';
+import { queriesMock } from 'app-shared/mocks/queriesMock';
+import { useQuery } from '@tanstack/react-query';
+import { textMock } from '../../../../testing/mocks/i18nMock';
+
+const wrapper = ({ children }) => (
+  <ServicesContextProvider {...queriesMock}>
+    {children}
+  </ServicesContextProvider>
+);
+
+describe('ServicesContext', () => {
+  it('displays a default error message if an API call fails', async () => {
+    const mockConsoleError = jest.spyOn(console, 'error').mockImplementation();
+    const { result } = renderHook(() => useQuery(['fetchData'],() => Promise.reject(), { retry: false }), { wrapper });
+
+    await waitFor(() => result.current.isError);
+
+    expect(await screen.findByText(textMock('general.error_message'))).toBeInTheDocument();
+    expect(mockConsoleError).toHaveBeenCalled();
+  });
+
+  it('displays a default error message if a component throws an error while rendering', () => {
+    const mockConsoleError = jest.spyOn(console, 'error').mockImplementation();
+
+    const ErrorComponent = () => { throw new Error('Intentional render error'); };
+    render(<ErrorComponent />, { wrapper });
+
+    expect(screen.getByText(textMock('general.error_message'))).toBeInTheDocument();
+    expect(screen.getByText(textMock('general.try_again'))).toBeInTheDocument();
+    expect(mockConsoleError).toHaveBeenCalled();
+  });
+});
diff --git a/frontend/packages/shared/src/contexts/ServicesContext.tsx b/frontend/packages/shared/src/contexts/ServicesContext.tsx
index df9e8c35e90..df274841694 100644
--- a/frontend/packages/shared/src/contexts/ServicesContext.tsx
+++ b/frontend/packages/shared/src/contexts/ServicesContext.tsx
@@ -1,27 +1,93 @@
-import React, { createContext, useContext, ReactNode } from 'react';
-import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import React, { createContext, useContext, ReactNode, useState } from 'react';
+import {
+  MutationCache,
+  MutationMeta,
+  QueryCache,
+  QueryClient,
+  QueryClientConfig,
+  QueryClientProvider,
+  QueryMeta,
+} from '@tanstack/react-query';
 import type * as queries from '../api/queries';
 import type * as mutations from '../api/mutations';
 import { ReactQueryDevtools } from '@tanstack/react-query-devtools';
+import { ToastContainer, Slide, toast } from 'react-toastify';
+import { ErrorBoundary } from 'react-error-boundary';
+import { AxiosError } from 'axios';
+import { Trans, useTranslation } from 'react-i18next';
+import { Link } from '@digdir/design-system-react';
+import { ErrorBoundaryFallback } from '../components/ErrorBoundaryFallback';
+
+import 'react-toastify/dist/ReactToastify.css';
+import 'app-shared/styles/toast.css';
 
 export type ServicesContextProps = typeof queries & typeof mutations;
 export type ServicesContextProviderProps = ServicesContextProps & {
   children?: ReactNode;
-  client?: QueryClient;
+  client?: QueryClient; // TODO : #10913 should probably be removed to force the use of QueryCache and MutationCache
+  clientConfig?: QueryClientConfig;
 };
 
 const ServicesContext = createContext<ServicesContextProps>(null);
-const queryClient = new QueryClient();
+
+const handleError = (
+  error: AxiosError,
+  t: (key: string) => string,
+  meta: QueryMeta | MutationMeta,
+): void => {
+  // TODO : log axios errors
+  // TODO : handle messages from API
+  // TODO : logout user when session is expired
+
+  if (
+    meta?.hideDefaultError === true ||
+    (meta?.hideDefaultError instanceof Function && meta?.hideDefaultError?.(error))
+  )
+    return;
+
+  toast.error(() => (
+    <Trans i18nKey={'general.error_message'} components={{ a: <Link inverted={true}>Slack</Link> }}/>
+  ), { toastId: 'default' });
+};
+
 export const ServicesContextProvider = ({
   children,
   client,
+  clientConfig,
   ...queries
 }: ServicesContextProviderProps) => {
+  const { t } = useTranslation();
+
+  const [queryClient] = useState(
+    () => client || new QueryClient({
+      ...clientConfig,
+      queryCache: new QueryCache({
+        onError: (error: AxiosError, query) => handleError(error, t, query.options?.meta),
+      }),
+      mutationCache: new MutationCache({
+        onError: (error: AxiosError, variables, context, mutation) => handleError(error, t, mutation.options?.meta),
+      }),
+    })
+  );
+
   return (
-    <QueryClientProvider client={client || queryClient}>
-      <ServicesContext.Provider value={{ ...queries }}>{children}</ServicesContext.Provider>
-      <ReactQueryDevtools initialIsOpen={false} />
-    </QueryClientProvider>
+    <ErrorBoundary
+      FallbackComponent={ErrorBoundaryFallback}
+      onError={() => {
+        // TODO : log rendering errors
+      }}
+    >
+      <ToastContainer
+        position='top-center'
+        autoClose={5000}
+        theme='colored'
+        transition={Slide}
+      />
+      <QueryClientProvider client={queryClient}>
+        <ServicesContext.Provider value={{ ...queries }}>{children}</ServicesContext.Provider>
+        <ReactQueryDevtools initialIsOpen={false} />
+      </QueryClientProvider>
+    </ErrorBoundary>
   );
 };
 
diff --git a/frontend/packages/shared/src/styles/toast.css b/frontend/packages/shared/src/styles/toast.css
new file mode 100644
index 00000000000..33b81e6b453
--- /dev/null
+++ b/frontend/packages/shared/src/styles/toast.css
@@ -0,0 +1,12 @@
+:root {
+  --toastify-color-info: var(--fds-semantic-surface-action-primary-default);
+  --toastify-color-success: var(--fds-semantic-surface-success-default);
+  --toastify-color-warning: var(--fds-semantic-surface-warning-default);
+  --toastify-color-error: var(--fds-semantic-surface-danger-default);
+  --toastify-toast-width: 400px;
+}
+
+.Toastify__toast {
+  line-height: 1.5rem;
+  padding: var(--fds-spacing-3) var(--fds-spacing-3) var(--fds-spacing-4) var(--fds-spacing-3);
+}
diff --git a/frontend/packages/ux-editor/src/components/TextResourceEdit.test.tsx b/frontend/packages/ux-editor/src/components/TextResourceEdit.test.tsx
index 4c9a83308ea..a3f6cfe8bd1 100644
--- a/frontend/packages/ux-editor/src/components/TextResourceEdit.test.tsx
+++ b/frontend/packages/ux-editor/src/components/TextResourceEdit.test.tsx
@@ -50,8 +50,10 @@ describe('TextResourceEdit', () => {
   });
 
   it('Does not render anything if edit id is undefined', async () => {
-    const { renderResult } = await render();
-    expect(renderResult.container).toBeEmptyDOMElement();
+    await render();
+    expect(screen.queryByText(legendText)).not.toBeInTheDocument();
+    expect(screen.queryByRole('textbox')).not.toBeInTheDocument();
+    expect(screen.queryByRole('button', { name: closeText })).not.toBeInTheDocument();
   });
 
   it('Renders correctly when a valid edit id is given', async () => {
diff --git a/frontend/resourceadm/index.tsx b/frontend/resourceadm/index.tsx
index 15b4f7feab2..a9338e902bd 100644
--- a/frontend/resourceadm/index.tsx
+++ b/frontend/resourceadm/index.tsx
@@ -9,7 +9,7 @@ import nb from '../language/src/nb.json';
 import en from '../language/src/en.json';
 import { DEFAULT_LANGUAGE } from 'app-shared/constants';
 
-import { QueryClient } from '@tanstack/react-query';
+import { QueryClientConfig } from '@tanstack/react-query';
 import { ServicesContextProvider } from 'app-shared/contexts/ServicesContext';
 import * as queries from 'app-shared/api/queries';
 import * as mutations from 'app-shared/api/mutations';
@@ -27,7 +27,7 @@ i18next.use(initReactI18next).init({
 const container = document.getElementById('root');
 const root = createRoot(container);
 
-const queryClient = new QueryClient({
+const queryClientConfig: QueryClientConfig = {
   defaultOptions: {
     queries: {
       retry: false,
@@ -35,11 +35,11 @@ const queryClient = new QueryClient({
       refetchOnWindowFocus: false,
     },
   },
-});
+};
 
 root.render(
   <BrowserRouter basename={RESOURCEADM_BASENAME}>
-    <ServicesContextProvider client={queryClient} {...queries} {...mutations}>
+    <ServicesContextProvider clientConfig={queryClientConfig} {...queries} {...mutations}>
       <App />
     </ServicesContextProvider>
   </BrowserRouter>
diff --git a/package.json b/package.json
index f71bc3a0db3..b59854383f8 100644
--- a/package.json
+++ b/package.json
@@ -11,8 +11,10 @@
     "@tanstack/react-query-devtools": "4.33.0",
     "ajv": "8.12.0",
     "ajv-formats": "2.1.1",
+    "react-error-boundary": "^4.0.11",
     "react-i18next": "13.1.2",
-    "react-router-dom": "6.15.0"
+    "react-router-dom": "6.15.0",
+    "react-toastify": "^9.1.3"
   },
   "devDependencies": {
     "@emotion/react": "11.11.1",
diff --git a/yarn.lock b/yarn.lock
index 4fcaa11489d..a4eceb2b6ba 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5126,8 +5126,10 @@ __metadata:
     prettier: 2.8.8
     react: 18.2.0
     react-dom: 18.2.0
+    react-error-boundary: ^4.0.11
     react-i18next: 13.1.2
     react-router-dom: 6.15.0
+    react-toastify: ^9.1.3
     redux-mock-store: 1.5.4
     redux-saga: 1.2.3
     redux-saga-test-plan: 4.0.6
@@ -6368,7 +6370,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"clsx@npm:^1.2.1":
+"clsx@npm:^1.1.1, clsx@npm:^1.2.1":
   version: 1.2.1
   resolution: "clsx@npm:1.2.1"
   checksum: 30befca8019b2eb7dbad38cff6266cf543091dae2825c856a62a8ccf2c3ab9c2907c4d12b288b73101196767f66812365400a227581484a05f968b0307cfaf12
@@ -13153,6 +13155,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"react-error-boundary@npm:^4.0.11":
+  version: 4.0.11
+  resolution: "react-error-boundary@npm:4.0.11"
+  dependencies:
+    "@babel/runtime": ^7.12.5
+  peerDependencies:
+    react: ">=16.13.1"
+  checksum: b3c157fea4e8f78411e9aa0fbf5241f6907b66ede1cd8b7bb22faaeb0339ebeb3dc8e63bf90ef3f740bfa8fd994ca6edf975089cd371b664ad6c2735e7512d38
+  languageName: node
+  linkType: hard
+
 "react-i18next@npm:13.1.2":
   version: 13.1.2
   resolution: "react-i18next@npm:13.1.2"
@@ -13367,6 +13380,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"react-toastify@npm:^9.1.3":
+  version: 9.1.3
+  resolution: "react-toastify@npm:9.1.3"
+  dependencies:
+    clsx: ^1.1.1
+  peerDependencies:
+    react: ">=16"
+    react-dom: ">=16"
+  checksum: e8bd92c5cbf831b43a042644ab9bc69abe6ceb3ce91ba71f5cd2d8b6a2c9885ca52770e1f1ba64c5632607f6df962db344a26c7fba57606faf5aa0e7bfc8535f
+  languageName: node
+  linkType: hard
+
 "react-transition-group@npm:^4.3.0, react-transition-group@npm:^4.4.5":
   version: 4.4.5
   resolution: "react-transition-group@npm:4.4.5"