Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Stopped working after three months

We bought this product in January, and it stopped working after a few months. I called the company, and was told I would have to buy another unit. When I asked her why I would buy another after the first one stopped working, she said she could offer me a discount on the new unit. I have no idea why anyone would want to repurchase a product that only lasts a few months. The unit also had to be taken apart every few days and cleaned because of gunk that would settle and build up in the tray where the brushes sit.