Mailbox Status "StalledDueToReadUnknown" when moving Mailboxes to another Database.

I was Moving 30 Mailboxes from DB01 to DB10 in Exchange 2013 But when i checked the MoveRequestStatistics i get the results below on those 3 mailboxes.however the 27 mailboxes move status is complete; 

Get-MoveRequestStatistics -MoveRequestQueue "DB10"

 StatusDetail                         TotalMailboxSize                   TotalArchiveSize         PercentComplete
 ------------                           ----------------                      ----------------            ---------------
 StalledDueToReadUnknown   6.429 GB (6,903,271,42...                                     20
 StalledDueToReadUnknown   7.707 GB (8,274,870,98...                                     20
 StalledDueToReadUnknown   4.995 GB (5,363,055,92...                                     20

Please help, How can get those 3 mailboxes from that state to completethe move  to 100 percent being they are stack at 20 percent 

Thanks in Advance...