Had the TV running for ~5 hours with the new box and cable and no restarts, so something definitely happened. This box is different from the last one, as it gets warm in the middle and not on the left side. The menu became very responsive, which was sluggish and unresponsive even when the TV wasn't in restart cycle.
I am a bit concerned that it is already heating up quite well (not uncomfortably hot on touch, but it feels close to a really hot shower). I was surprised that the new box I got is older (04. 2017.) than the last one. I can only hope that this problem won't occur again (especially out of warranty as these 2 parts could cost the same as a new TV).
I bought the 65" QN65Q7FA QLED from New Egg, and it worked fine for literally 2 weeks. It started doing the reboot thing.
I should've just returned it to New Egg, but instead went through Samsung. The tech was friendly enough with good English, but said they'd just ship out a new One connect box (or whatever it's called).
I KNEW when I installed the TV, that it was bad design to rely on that device. The only connection my TV has is power and the One Connect fiber optic cable. So if the box ever breaks (like mine did less than 14 days old) then you're screw ed.
I requested the item be overnighted, the tech claims he put the note on the shipment order but we'll see.
This thread is huge with TONS OF PEOPLE HAVING THE SAME PROBLEM. Obviously there's a defect going on, they need to make it right. I should've just paid slightly more for the Sony one :*(
You hit the nail on the head. My feedback to samsung team is with new technology like this, there should be an extra interface installed on the display that will provide a basic connection. So that when there are problems, customers can still functional use the display.