With no apparent system changes, my Panasonic. when first powered on, has started changing inputs on its own. It changes with no human interaction from Roku 3 to Soundtouch 300. I set it back to Roku, it switches back to Soundtouch. This persists about 30 seconds after turning on TV and Soundbar. The units are connected vial HDMI ARC cable
My Samsung tv was switching input sources automatically and it was so annoying. I removed the back of the tv and cleaned the mother board. I wiped and blow dried it. Since I did that I haven't had any more issues with my tv. I was not going to spend $250 to fix it like the tv repair man quote.