My cable box is connected to my Denon which connects to Samsung Q80 using HDMI (ARC). We use 2 remotes: CBL/TV and Denon. We power on Denon remote and then CBL/TV remote. This worked great for 10 months but recently the TV shuts off after about 30 seconds and Denon goes from CBL/SAT mode to TV Audio. If I hit CBL/SAT button on Denon, the TV usually turns on, but sometimes it takes several tries for the TV to come on. This is an effective (but annoying) workaround for me but my wife gets very confused about it. Hitting 2 buttons is her limit. This worked fine for 10 months so why is it now a problem? I need to solve this problem so my wife can watch our home theatre TV without my assistance in setting up.
I contacted the vendor I bought Denon from. They tried a couple of things but could not fix it. They said that the Samsung TV may be sending signal to receiver causing it to switch modes and causing TV to shut off. If that is true, why did it just start recently and what is triggering it to do this?
One other thing. I had to do a factory reset on Denon a couple of weeks ago due to the Denon remote freezing (we use Denon remote to control sound on TV) and the problem began after that. The vendor walked me thru the factory reset so it seems unlikely that something was done incorrectly.
This is my first post and I look forward to your recommendations of how to solve this problem.
Thanks,
John