Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Stopping working after 1 month

I've never had a heating pad be a dud like this, but this unit started to malfunction in less than 1 month. It gave an error code, which at first I could reset by unplugging it. It was a pain to have to unplug it to reset it, instead of just pressing the on/off button. After a while it just showed the error, and I gave up on the darn thing.It's otherwise a nice design & perfect for my needs - I strapped it to the back of my chair in my office to keep my back from cramping up while typing. Most heating pads without straps will start to roll into a bundle unless you are lying right on top of them. But I dont want to waste my money again trying another of these, given the extremely short life.