So spent a while dumping my external hd's onto internal and now trying to re organise everything. everytime i move large files between the internals explorer goes crazy or just stops. if i move to an external its fine. from one internal to the other via external is fine. back up function is fine. everything on both internals play fine, load fine, in full working order i just cant move more than about a gig from 1 internal to the other without it crashing.i havnt lost any data and putting things back to external just incase. diskcheck all clear. 2x1tb internals. i can still do everything i have to its just slower this way. any ideas?