Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unstable as my ex-wife.

Pleasant most of the time but occasionally looses paring for no reason accounting for much frustration. I have a ritual of shaking it, bumping it, pressing the reset button, and turning it off and back on again. The ritual is required whenever the screen saver goes back to login and makes the mouse turn itself off. Aggggggghh!