We have a suite of RM Ones and some of the computers are seemingly randomly typing 2 letters together. The shift key stops working, and sometimes the backspace. The letters it types together is different on each computer, and even after swapping keyboards it still does it after about 5 after booting up.

Tried USB and PS2. These computers also sometimes have problems with the mice stopping working until you either restart or unplug it and move it to another USB port.

This is a fresh Windows 7 image on each machine, and an identical suite of slightly older revision do not share the problem. It's is isolated to these computers.

Any help appreciated.