Mailbox Move Problem

Hi,

I need mailbox move between 2 exchange 2013 mailbox server. But we receive an error message and failed job. Status datail StalledDueToWriteUnknown. how to correct this problem ? thank you.

New-MoveRequest -Identity "user1" -TargetDatabase "Mailbox DataBase05" -BadItemLimit 300

[PS] C:\Windows\system32>Get-MoveRequestStatistics -Identity user1

DisplayName               StatusDetail              TotalMailboxSize          TotalArchiveSize         PercentComplete
-----------               ------------              ----------------          ----------------         ---------------
user1                     StalledDueToWriteUnknown  1.704 GB (1,829,622,48...                          20