Re: Mice too
I had the opposite problem in a previous job.
The mouse hooked up via the KVM to all our servers sat on a metal tray, with a crinkly white gloss finish. Even when left still, it would detect minor movements, so the cursor would jitter on the screen, and the screensaver, and more importantly, the screenlock, would never engage.
I solved the problem by sticking a post-it note under where the mouse was left at rest, and less reflective surface banished the phantom movements.
More fun can be had by sticking the post-it to the bottom of a colleagues mouse, but they usually work it out quite quickly.