setareh2255,

I'm sorry to hear that you're having this problem.

I would recommend having the unit serviced. You can call 800-SAMSUNG or set up an online service request form here:

http://www.samsung.com/us/support/online/supportOnlineServiceRequest.do

There's no troubleshooting that I could recommend. Even a temporary fix may result in a bigger problem down the road, and I don't want to see your warranty run out before you get it repaired.

--HDTech