Error prowlarr on opening

Sonarr version (exact version): 4.0.1.929
Mono version (if Sonarr is not running on Windows):
OS: Synology Nas DS920+ on Container
Debug logs:
Description of issue:

Good morning,
I have long ago installed sonarr and prowlarr as containers on Nas Synology Ds920+.
Everything works fine except for one problem that occasionally occurs with Prowlarr.
I happen to search Sonarr and find nothing, then I check by opening Prowlarr and after logging in I get an error page like the following:

Other times I can still get into prowlarr but the indexers won’t connect.
In both cases to solve I have to recreate the container (I do this via Portainer).
After recreating the container everything works again until the problem recurs.
Would anyone be able to tell me what this annoying problem depends on?

Thank you

Error on prowlarr login:

{
  "message": "An error occurred while trying to encrypt the provided data. Refer to the inner exception for more information. For more information go to http://aka.ms/dataprotectionwarning",
  "description": "System.Security.Cryptography.CryptographicException: An error occurred while trying to encrypt the provided data. Refer to the inner exception for more information. For more information go to http://aka.ms/dataprotectionwarning\n ---\u003E System.UnauthorizedAccessException: Access to the path \u0027/config/asp/key-5a9aa130-5487-4962-b13e-1c82f99e7763.xml\u0027 is denied.\n ---\u003E System.IO.IOException: Permission denied\n   --- End of inner exception stack trace ---\n   at Interop.CheckIo(Error error, String path, Boolean isDirectory, Func\u00602 errorRewriter)\n   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode)\n   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize)\n   at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize)\n   at System.IO.Strategies.FileStreamHelpers.ChooseStrategy(FileStream fileStream, String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, Int64 preallocationSize)\n   at System.IO.File.OpenRead(String path)\n   at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.ReadElementFromFile(String fullPath)\n   at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.GetAllElementsCore()\u002BMoveNext()\n   at System.Collections.Generic.List\u00601..ctor(IEnumerable\u00601 collection)\n   at System.Linq.Enumerable.ToList[TSource](IEnumerable\u00601 source)\n   at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.GetAllElements()\n   at Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager.GetAllKeys()\n   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.CreateCacheableKeyRingCore(DateTimeOffset now, IKey keyJustAdded)\n   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.Microsoft.AspNetCore.DataProtection.KeyManagement.Internal.ICacheableKeyRingProvider.GetCacheableKeyRing(DateTimeOffset now)\n   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.GetCurrentKeyRingCore(DateTime utcNow, Boolean forceRefresh)\n   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.GetCurrentKeyRing()\n   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingBasedDataProtector.Protect(Byte[] plaintext)\n   --- End of inner exception stack trace ---\n   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingBasedDataProtector.Protect(Byte[] plaintext)\n   at Microsoft.AspNetCore.Authentication.SecureDataFormat\u00601.Protect(TData data, String purpose)\n   at Microsoft.AspNetCore.Authentication.Cookies.CookieAuthenticationHandler.HandleSignInAsync(ClaimsPrincipal user, AuthenticationProperties properties)\n   at Microsoft.AspNetCore.Authentication.AuthenticationService.SignInAsync(HttpContext context, String scheme, ClaimsPrincipal principal, AuthenticationProperties properties)\n   at Prowlarr.Http.Authentication.AuthenticationController.Login(LoginResource resource, String returnUrl) in ./Prowlarr.Http/Authentication/AuthenticationController.cs:line 47\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.\u003CInvokeActionMethodAsync\u003Eg__Awaited|12_0(ControllerActionInvoker invoker, ValueTask\u00601 actionResultValueTask)\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.\u003CInvokeNextActionFilterAsync\u003Eg__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State\u0026 next, Scope\u0026 scope, Object\u0026 state, Boolean\u0026 isCompleted)\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()\n--- End of stack trace from previous location ---\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.\u003CInvokeFilterPipelineAsync\u003Eg__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.\u003CInvokeAsync\u003Eg__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)\n   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.\u003CInvokeAsync\u003Eg__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)\n   at Microsoft.AspNetCore.Routing.EndpointMiddleware.\u003CInvoke\u003Eg__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)\n   at Prowlarr.Http.Middleware.BufferingMiddleware.InvokeAsync(HttpContext context) in ./Prowlarr.Http/Middleware/BufferingMiddleware.cs:line 28\n   at Prowlarr.Http.Middleware.IfModifiedMiddleware.InvokeAsync(HttpContext context) in ./Prowlarr.Http/Middleware/IfModifiedMiddleware.cs:line 41\n   at Prowlarr.Http.Middleware.CacheHeaderMiddleware.InvokeAsync(HttpContext context) in ./Prowlarr.Http/Middleware/CacheHeaderMiddleware.cs:line 33\n   at Prowlarr.Http.Middleware.StartingUpMiddleware.InvokeAsync(HttpContext context) in ./Prowlarr.Http/Middleware/StartingUpMiddleware.cs:line 38\n   at Prowlarr.Http.Middleware.UrlBaseMiddleware.InvokeAsync(HttpContext context) in ./Prowlarr.Http/Middleware/UrlBaseMiddleware.cs:line 27\n   at Prowlarr.Http.Middleware.VersionMiddleware.InvokeAsync(HttpContext context) in ./Prowlarr.Http/Middleware/VersionMiddleware.cs:line 29\n   at Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.InvokeCore(HttpContext context)\n   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)\n   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.\u003CInvoke\u003Eg__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)"
}

Not a Sonarr issue. Use Prowlarr’s Discord server for support.