Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not satisfied

After about a month's use, this unit just suddenly loses power. This can occur during playback, or even when not in use. I have to unplug it, then wait a while, then plug it back in, and then it will flash "AUTO" and it works againg for a while (so far). This is a recurring problem - if anyone knows what causes this, I would appreciate any possible clues.