I found this thread while looking for a solution. My last TV was a 8 series and I had these same issues with my Marantz 5011 b ut would usually work for a couple of months before messing up. The TV was a few years old so I figured a brand new TV would have all of these issues sorted out. Boy was I wrong. I recently bought a 75in Q9fn. It's a $5000 TV and Samsungs top Qled for 2018. And guess what? It's even worse! It looses ARC connection anytime the TV is powered off. Luckily I'm still in the return period so this this is going back and I will be going with an LG. I was a loyal Samsung TV customer and have bought 5 TVs over the last few years but this issue and lack of resolution has turned me off. Samsung please get your act together.
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