Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Stopped working

The first time I used these clippers they stopped working after about 20min. I don't know if they overheated, or hair got caught in the motor/blade, but the blade just stopped running. I've used drug-store Wahl clippers in the past, and they've worked well... until they don't, which is after a couple of years. So, I figured I'd pay up for a "professional" model. Well, I'm going back to Wahl, but will try their "Designer Professional" model: http://www.amazon.com/gp/product/B000EDNCJO/ref=ox_sc_act_title_1?ie=UTF8&m=ADTIEFXMUOV0B