Heat bed causes USB failure

I can print no problem without the heat bed connected, but as soon as I plug it in my computer and printer can't seem to communicate for more than a minute. Tried printing on two different computers with the same problem. The bed heats up and the print will run for about a minute then "dunt dunt" disconnected.. Print stops and my forehead hits the desk.

Solidoodle 2, Win 7, Aluminum heat bed for S2