I've got 5 external hard drives going to my pc via a powered USB hub.

Sometimes I can successfully access and stream video files, other time I can't. I've tried taken them off the hub and plugging them direct into the PC with varying results. Sometimes I can stream no problem, other times the playback is choppy and will crash.

I'm running Xubuntu 12.10 and the PC is a Revo 3700. Any help would be greatly appreciated.