Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Breaks alot

I use this item at work. So far in the span of about 2 months, 2 of them have broken, meaning the middle ball stopped scrolling downward.Another complaint I have is that the left and right mouse click isn't reliable because they actually aren't separate buttons. Periodically the mouse also goes into spaz mode where it will autoclick by itself for long periods of time (up to a minute).I'm not impressed, and have to replace 2 mice now and will not purchase another unmighty mouse.