Weird control problem on Facebook Gameroom

Recently, my Facebook Gameroom install has been acting very weirdly: when I begin a game, my robot slowly rotates to the right, as if the mouse was moving very slowly to change the view. In no other instance is my mouse input drifting. I've tried uninstalling and reinstalling Gameroom and the War Robots app. Nothing seems to work.

Anyone have any idea how to help? I submitted a help request to Pix, but haven't heard back from them.

Thanks!