Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: ITEM FAILED WITH LESS THAN ONE YEAR OF USE

This UPS worked great until it developed a major problem. Every day, or every week, or every other week at a random time it will just shut off. No beeps, no warnings, no indications whatsoever of a problem. It just instantly shuts down! It will always turn back on when I press the power button, and then it's fine for a while until it decides to do it again. I will never purchase another Tripp Lite product again. The software that comes with Tripp Lite (PowerAlert Console) is not the best, but it does the job. Tripp Lite customer service is useless.