This issue is NOT solved/fixed.
I bought a brand new Samsung QE55Q9F (2018) - QLED TV in Belgium, Europe:
The TV turns on, works for 20 seconds or so and reboots indefinitely.
After switching off the TV it will power on spontaneously.
The thing is essentially DOA. Very dissapointing given that, judging from this thread, this is a very common theme and these TV's cost so much.
I had this issue with 65” Q7FN. It’s worth a try to unplug the antenna cable. I changed my old cheap cable (which worked ok with previous tv) to a new one and to my surpise that fixed it! Most likely won’t help everyone.
I still can’t recommend keeping the tv until they fix the issues with local dimming (or at least let people switch it off).
Its starting to happen to my 65 Q8FN! L was advised by Samsung to disconnect the tv while turned on for 30sec. Them plug in. It seems to be an issue with the new firmware 1057. Thats when i started noticing the problem.
Can someone please verify? I just noticed that when watching Jessice Jones on Netflix, second season episod 2 at exactly 1:48, my 65QFN re starts. Does not happen on any other Movie or show. At least not yet. If i skip past this time I have no issues.