Each data refresh gives different data results

[r_maiocchi]

I created a .PBIX file with a model and it has been working correctly for 3 months. Data sources are SQL Server 2014 and some Excel worksheets. After updating Power BI Desktop to the latest version, everytime I refresh the data it gives different results and they are always wrong. I have checked all the queries and the relations between tables and there have been no changes. I have also carried out tests on the data sources with SQL Management Studio and everything is correct. Everything would suggest that Power BI imports a different number of rows at each refresh (even when I press the refresh button every few seconds), but the table contains always the same (correct) number of rows. It seems that the error is an issue that involves only the Reports. What could be the reason? Do I have to fix some settings?

[r_maiocchi]

I enabled trace and I found these 3 errors: Error 1: EvaluationContainerMain/ExceptionHandler/HandleException,"Exception: ExceptionType: System.Threading.AbandonedMutexException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 Message: The wait completed due to an abandoned mutex. StackTrace: at System.Threading.WaitHandle.InternalWaitOne(SafeHandle waitableSafeHandle, Int64 millisecondsTimeout, Boolean hasThreadAffinity, Boolean exitContext) at Microsoft.Mashup.Container.EvaluationContainerMain.WaitForParentExitThread(Object state) at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass15.b__14(Object o)" Error 2: EvaluationContainerMain/ExceptionHandler/HandleException,"Exception: ExceptionType: System.IO.EndOfStreamException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 Message: Unable to read beyond the end of the stream. StackTrace: at System.IO.BinaryReader.FillBuffer(Int32 numBytes) at System.IO.BinaryReader.ReadInt32 () at Microsoft.Mashup.Evaluator.StreamMessenger.Read () at Microsoft.Mashup.Evaluator.ChannelMessenger.Read(MessageChannel channel) at Microsoft.Mashup.Evaluator.ChannelMessenger.MessageChannel.Read () at Microsoft.Mashup.Evaluator.Interface.IMessengerExtensions.WaitFor[T](IMessenger messenger, Action`2 handler) at Microsoft.Mashup.Evaluator.RemoteServiceEnvironment.CreateServiceProxies(IMessenger messenger, IRemoteServiceProxy[]& services) at Microsoft.Mashup.Evaluator.EvaluationHost.Run () at Microsoft.Mashup.Container.EvaluationContainerMain.Run(Object args) at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass15.b__14(Object o)" Error 3: EvaluationContainerMain/ExceptionHandler/HandleException,"Exception: ExceptionType: System.Threading.AbandonedMutexException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 Message: The wait completed due to an abandoned mutex. Stac