backups failing with the message Failed on: Negotiating transferred blocks consistency

i have a back up job that is failing with the following log info

Transfer of volumes [F:\, D:\, C:\] from 'tengu' :

ID:  f07880cd     Status:Succeeded    Total Work:47.63 GB

Start Time:8/30/2018 8:15:35 PM    End Time:8/30/2018 8:20:29 PM
Rate:3.19 MB/s      Elapsed Time:4 minute(s), 54 second(s)

Child Tasks
Name                                                 |Start Time                      End Time                     Elapsed Time    Phase
Transfer incremental backup of 'F:\'   8/30/2018 8:20:12 PM    8/30/2018 8:20:14 PM    1 second(s)
Transfer incremental backup of 'D:\'  8/30/2018 8:20:14 PM    8/30/2018 8:20:15 PM    1 second(s)
Transfer base image backup of 'C:\'   8/30/2018 8:20:15 PM    8/30/2018 8:20:29 PM    13 second(s) - > Failed on: Negotiating transferred blocks consistency

Now this a new one because it almost always fails and we get the the error log that says:

Exception chain:
Failed to get the size of '\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy113' - The system cannot find the file specified
Network error during transfer of data from volume
The transfer failed for volume 'C:\'
The transfer of one or more volume images from a protected machine to the Core has failed
One or more errors occurred.

Server side:
Replay.Core.Contracts.Transfer.CoreTransferFailedException: The transfer of one or more volume images from a protected machine to the Core has failed ---> System.AggregateException: One or more errors occurred. ---> Replay.Core.Contracts.Transfer.CoreVolumeTransferFailedException: The transfer failed for volume 'C:\' ---> System.AggregateException: One or more errors occurred. ---> Replay.Core.Contracts.Transfer.CoreVolumeTransferNetworkErrorException: Network error during transfer of data from volume ---> Replay.Common.Contracts.Win32Api.Win32ApiFailedException: Failed to get the size of '\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy113' - The system cannot find the file specified
   at Replay.Common.Implementation.Win32Api.NativeMethods.ThrowLastError(String message, Object[] args)
   at Replay.Common.Implementation.Win32Api.NativeIOReader.GetFileSize()
   at Replay.Agent.Implementation.Transfer.TransferDataConnection.HandleRequest(TransferDataRequest request)



--- End of inner exception stack trace ---
   at Replay.Core.Implementation.Transfer.VolumeDataReaderStream.ReadResponsePreamble(TransferDataIORequest ioRequest, UInt32& dataLength)
   at Replay.Core.Implementation.Transfer.VolumeDataReaderStream.HandleResponse(TransferDataIORequest ioRequest)
   at Replay.Core.Implementation.Transfer.VolumeDataReaderStream.HandleQueuedResponse()
   at Replay.Core.Implementation.Transfer.VolumeDataReaderStream.ProcessIoRequestWithQueuing(TransferDataIORequest ioRequest)
   at Replay.Core.Implementation.Transfer.VolumeDataReaderStream.ProcessIoRequestsWithQueueing(Int32 initialQueueSize)
   at Replay.Core.Implementation.Transfer.VolumeDataReaderStream.StartProcessingIoRequests()
   at Replay.Core.Implementation.Transfer.VolumeDataReaderStream.b_190()
   at System.Threading.Tasks.Task.Execute()



--- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   at Replay.Core.Implementation.Transfer.TransferJob.TransferData()
   at Replay.Core.Implementation.Transfer.TransferJob.TransferTaskSteps()
   at Replay.Core.Implementation.Transfer.TransferJob.TransferTaskInternal()
   at Replay.Core.Implementation.Transfer.TransferJob.TransferAgentTask()
   at Replay.Core.Implementation.Transfer.TransferJob.TransferTask()
   at System.Threading.Tasks.Task.Execute()


now i have checked to make sure VSS and the agents are on and active, even restarted them on the target machine. any idea's as to how to fix this would be greatly appreciated.  

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