Instruct: Classify a given Amazon review as either positive or negative.
Query: Great sound, but doesn't last long

At fist the HoMedics worked great. There are many sounds to choose from, and they are all quite pleasant. However, within 3-4 months the sound would cut out - almost as if there was a temporary loss of power, only there wasn't. We tried unplugging it to reset it, and that helped for awhile. But it gradually got worse. Last night it would run for 1/2 hour and then turn off and stay off. I tried unplugging it, and it started up again but then turned off and stayed off after a 1/2 hour or so. It's officially not working anymore and we are now looking for a new brand.