Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lot of problems with this TV

I bought this TV three months ago; it worked fine as long as it was connected to a DVD player only. Once I got Comcast HD and plugged it into the TV- strange things started to happen. Ten/fifteen minutes after starting the TV - it would switch itself off - then on again - off again. It was very irritating and you have no control over it.I experienced the same problem even when I was trying to play DVD.Some of the HD channels still ran in 4:3 screen and left two big black bars on the sides - the zoom feature did not work for these channels. But sometimes it automatically fits the full screen. The picture quality was good (while it worked), but this model seems to have a lot of technical problems. Costco was too nice to take it back and give me a full refund.