Error: The sourcedocument failed to save.. Exception=System.IO.FileNotFoundException: Could not find file

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When reloading a task I have this error:

[Task Log]

Information: Exception when trying to move or delete file. (Files: Dest). Exception: Could not find file '\\servername\QVS\QlikView\Source Documents\foldername\App\foldername\tmp.appname.qvw'.

Error: The sourcedocument failed to save.. Exception=System.IO.FileNotFoundException: Could not find file '\\servername\QVS\QlikView\Source Documents\foldername\App\foldername\tmp.appname.qvw'. || File name: '\\servername\QVS\QlikView\Source Documents\foldername\App\foldername\tmp.appname.qvw' || at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) || at System.IO.File.InternalMove(String sourceFileName, String destFileName, Boolean checkHost) || at SolutionGlobal.FileSystem.FileSupport.MoveFile(String sourceFile, String destinationFile, Nullable`1 tryFor, Nullable`1 sleepDuration) || at QVBWrapper.Document.ReplaceSourceFile(ILogBucket logBucket, String sourceFileName, String destFileName) || at QVBWrapper.Document.Save(ILogBucket i_LogBucket, String i_SaveAsFileName)

Could someone provide a solution to this error?

I have already tried checking the file system with Process Monitor, but nothing was locking or deleting any files.

Also, I have disabled the AV, including Microsoft Defender.

Thanks,

Alessandro

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[Update - 03/01/2023]

Today the same error occurred, with a different message:

Error Exception in save source file: There are no more files.

Error File is not ok. Target file was not saved.

Does anyone have any idea how to solve this problem?
It is occurring more and more often and is sometimes blocking production.

Thanks,

Alessandro