Iso ep Issue : win xp on virtualbox4.2 in ubuntu-14.04-x64, iso endpoint receive error frames.

hi, there
     A strange issue with libusbk: not all frames are error, only some frames is error.
     Logs like:
     "ISO StartFrame=0009771Ah NumberOfPackets=64 ErrorCount=7 Transferred=969
ISO StartFrame=0009775Ah NumberOfPackets=64 ErrorCount=7 Transferred=969
ISO StartFrame=0009779Ah NumberOfPackets=64 ErrorCount=8 Transferred=952
ISO StartFrame=000977DAh NumberOfPackets=64 ErrorCount=7 Transferred=969
ISO StartFrame=0009781Ah NumberOfPackets=64 ErrorCount=7 Transferred=969
ISO StartFrame=0009785Ah NumberOfPackets=64 ErrorCount=4 Transferred=1020
ISO StartFrame=0009789Ah NumberOfPackets=64 ErrorCount=5 Transferred=1003
ISO StartFrame=000978DAh NumberOfPackets=64 ErrorCount=6 Transferred=986"
   .
   Other endpoints work well.
   
   Thans for any idea.
   By the way, same xp iso, same application, same driver, not work on VMWare.

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