This has been an issue since day one and it happens on both of your SB's. The mouse will move on its own, or get stuck in the upper left corner of the monitor. It also detects the movement as clicks and causes its own set of problems. Here has been the fix: A binder clip to hold it open enough not to touch, but not enough to have it think the laptop itself is open. I'll make it to the MS store but I know the problem will be they cannot replicate the problem there. It usually takes an hour or two before it starts to happen. Just wondering if anyone else is having that issue?