Tascam Troubles

[S.C.U.D]

Hi, I had a load of problems With my Tascam 564 Portastudio last night. I seemed to be getting record error after record error. I was trying record two tracks of drums from my drum machine and two tracks of guitar. I have been using the tascam for months and have encountered record errors before but none of this magnitude. Could it be the signal level is too high ?? I spent alot of time getting the levels right. Could heat be a factor I did notice it was particulary warm the room i was recording in. Later i put an external fan on the tascam and it seemed to work better for a bit. Or do you think it may be in need of repair. Any help would be greatley welcomed. Also two of the HD data disks it uses went blank while ouitside of the machine. I have a denon hi fi and two speakers that i use to monitor, on my work top, is it possible that the speakers would blank the disks if one was waved in front of them