Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The worst heating pad I've ever had

This is the worst heating pad I've ever used. I bought this a few months ago, and from the beginning I had problems with it. It would turn itself off. I'm not talking about the auto shut off either. I'm talking as if a switch was flipped. It would blink the high heat indicator at me. I would have to unplug it for it to reset itself. At the end of my patience, I would unplug it and try again and it wouldn't reset at all. It wouldn't turn on at all, or turn on and shut off after about 5 minutes. It didn't matter what heat setting it was on either. I've had a lot of heating pads over the years and this was the biggest waste of money. I'll never buy one like this again!