Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worked great, until it didn't

I love this timer, I love the way it works, and it does wonders for my kids in being able to see when the time is almost up. We used it a ton. Then suddenly it started malfunctioning. We had to restart it several times, and now it won't even work long enough to use it, even if you do restart it, and we have only had it for a few months. I think it is a great idea, and if it didn't keep breaking I would give it 5 stars.