Instruct: Classify Amazon reviews into positive or negative sentiment
Query: they break down aftera while

I have had now two different Rio Volt SP90 stop working out of the Blue. I probably used each for around 3 months and they stopped working.The first stopped reading CD's, the second stopped spinning. It seems to be common for this product. Stay away! (While it worked it was very good, though it skipped a LOT, I couldn't even walk with it in my pocket).