Instruct: Classify Amazon reviews into positive or negative sentiment
Query: broken very easily

I purchased this item about a year ago and now it starts to moving stiffly. I tried cleaning the inside, change the battery and update the driver, but still once or twice it suddenly moves very slowly and looses its track. Even the click button failed very often. It's very annoying when I was fliping webpages and editing documents. I have to switch back to my touchpad to drag it back.