Instruct: Classify a review into positive or negative sentiment.
Query: broke after a few months

The product worked great out of the box. It was simple to use and effective. But after around 3 months of light use, the unit stopped working. The fan is not blowing and it is not heating the room. So now, I have to contact Vornado, ship the unit to them (at my own cost) and hope that it comes back functional. This is a real hassle and tremendously inconvenient.