Zbrush Cycling Subtools on its own

I have a rather strange bug happening in Zbrush right now. I'm home for the holidays so I installed Zbrush on my older laptop so I could do some stuff in the evening, but there is a strange bug where every 5 seconds or so it switches to another subtool. It's as if the arrow keys are being pressed on the keyboard, and it goes down the subtool list. I am doing some vrius scans right now, and disconnected my wacom and any other hardware from the laptop, but it continues to happen. The odd thing is that it's not affecting any other software. Web pages are not automatically scrolling, or anything like that, it's only Zbrush.

If anyone has ever encountered this in Zbrush, or knows of any other system wide culprits for me to check, please let me know. Thanks for the help!