I was able to use the Samsung TV remote to choose receiver from audio list, then back to TV speakers if I wanted. Suddenly, I am unable to do that without finding my receiver/home theater remote. Why? Nothing's changed! It was a feature I used daily, switching back and forth on speaker list from tv to receiver. I don't even know how it did it without me turning on the receiver, the first time I did it was a surprise. 2 years later, what changed?