Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Design defect

The size,the performance and handling are the best on market. The problem is with the on/off push button. The first one I had lasted 6 weeks before the on button stuck in the "On" position and ran out and wouldn't work again.I went through a lot of time and hassle before they replaced it. They lost the first one I sent back so it took two months to get the replacement. The replacement they sent me lasted over a year before the same thing happened again.This is disappointing. I am going to send this one off like the other one, maybe things will go better this time.