I have this problem too. My tablet started to freeze at somewhat heavy loading like Google Earth, but after that it freezed and reboots imeediately after reboot. I cannot do anything on it, after it reboots it works for maximum 10 seconds then it freezes and reboots itself. Sometimes it’s not rebooting it just stays freezed until the battery is consumed - no combination of buttons can make it unfreeze.

I tried all kind of software fixes - wiping cache, factory resets, new firmware. Nothing works. But at least find it comforting that when in debug/reset mode it is stable, is does not resets/freeze.

I noticed the right back part (near the volume/power buttons) is warmer than the rest. I even opened it using teardown guides found here on iFixit and disconnected baterry, ribbons, etc, and put them back. I tried to put some thermal paste in the warm part (I think it’s the CPU/GPU) to take away some heat. I behaves just the same after that - freezes after 10 seconds after booting - so at least I didn’t damage anything. Also I tried to put it in my freezer half an hour but it works just a few seconds more - maybe the heat it’s the problem, but why it heats so much suddenly ?

This is definitely a hardware problem. Now it freezes when rebooting, Samsung logo is displayed - only half of it. It stays like this until the battery is consumed