Disappearing images as well as "failed to export file from provide epi.fx.blob"

Hello all,

recently we noticed that some images had disappeared from pages. We're not sure why, when, and how many of them and which exactly. For now it looks just randomly. However it came to our attention just right now.

I don't think it maybe some editor mistake or corrupted file, because our editors are re-checking newly created pages instantly, so they would notice if any image would not be accessible from the very first publish of the page. There were ideas to blame server, but still, some abstract blames towards server issues...

Log message:

2020-08-07 16:55:50,617 [107] ERROR EPiServer.Global: Unhandled exception in ASP.NET
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Applications\***\Web\App_Data\blobs\0d4afbe3d64145cabcb43835567677df\cc170be8ede143239e185941fb3b2703.jpg'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at System.Web.HttpResponse.TransmitFile(String filename, Int64 offset, Int64 length)
   at System.Web.HttpResponseWrapper.TransmitFile(String filename)
   at EPiServer.Web.BlobHttpHandler.ProcessRequestAsyncInternal(HttpContextWrapper context, AsyncCallback cb, Object extraData)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Any ideas where to start to digging in much appreciated!

Also, when we try to copy/paste some pages, we're facing "failed to export file from provide epi.fx.blob" error message - but this one is not that common as disappearing images.

Screenshot - https://i.imgur.com/np0G9qe.png - any ideas what may be wrong? 

CMS version 11.

Thank you!