I bought the Samsung PN43F4500 three weeks ago. Loved the set. Last weekend, it started into the automatic shut down and start up issue. This has been a known issue on Samsung TVs for 6 years apparently. There was even a class action suit filed. After 3 calls to Samsung support, they had no answers other than to send out a tech. I told them no thanks. I'm not having a tech repair a 3 week old set. I took it back and bought the Panasonic TCP42x60. I don't have it yet, I'm waiting for it to ship to my local store so I have no opinion on the Panny...but beware of the Samsung.