Input switching issue
Hey all - first post here. I've tried to read as much of this nearly 1000 page thread as possible to see if the issue I'm having with my KS8500 (65", Costco variety) has been encountered by anyone else, and thus far have come up empty. I'm noticing two distinct issues, both seem to be maybe CEC / HDMI handshake related, but are very frustrating.
1) When turning on the TV via the home button my 4K Fire TV, occasionally I will have no sound (maybe every 3rd or 4th time) until I switch HDMI inputs and switch back to the Fire TV. I've tried changing HDMI input ports, new HDMI cables, and even switching out the 4K Fire TV for the one in my basement, and the issue persists.
2) When consuming HDR content via my XBox One S, when I switch back to my 4th Gen Apple TV (and prior to it, Roku Premiere +), the screen will flash black every couple of seconds, and the 'up' arrow on the remote 'seems' like it is being pressed (in that the cursor keeps moving up an icon with each screen flash). Again, I've tried two different devices, different HDMI ports, and replacing the HDMI cable and the issue persists.
Additional troubleshooting steps I've taken including factory resets of all of the aforementioned devices, resetting the Samsung Smart Hub, and even a full factory reset of the TV itself. My TV was just updated to the 1203 firmware via automatic updates, however this issue has been ongoing for at least two months (was on 1180 prior to earlier this week)
I'm just trying to cover all of my basis before I contact Samsung, and was hoping maybe someone on here would have a recommendation of something else I can try. I feel like I've exhausted most of the basic TV troubleshooting techniques I'm aware of, but I'm all ears if it means not sitting on the phone for hours on end with Samsung.
Thanks in advance!