Have you already tried to power reset the TV by unplugging it for a few minutes and plugging it back up?
Out of curiosity, what firmware are you on and what kind of HDMI cable are you using? I really haven't had issues until firmware 1260.8 and an HDMI cable I just picked up which was rated a HDMI 2.1 cable. Could be coincidence but maybe not. Haven't touched my setup since I set everything up in January but did change the HDMI cable this Saturday and firmware was just update last week as well so that could also be the issue.
My problem turned out to be the HDMI cables that I recently purchased. I thought I would be proactive and upgraded all my cables to HDMI 2.1 standards and after changing everything over, that's when my reboots started. I never would have thought that HDMI cables would cause such an issue but I spent last weekend experimenting with a few different cables, including some other HDMI 2.1 ones that I got from Monoprice and sure enough, the first 2.1 cables I received were the cause of my reboots. The 2.1 cables I got from Monoprice are working great and reboots have completely stopped. I had previously been using ATEVON 2.0 HDMI cables that I purchased from Amazon and those cables were awesome and are still being used for some of my gear in my entertainment center.
It's not a hardware problem, it's a freesinch option.
There are more topics but Samsung does not respond!!!
Not sure if my situtaiion is related to the rebooting , but here it is . My Q9FN ( 9 month old ) wont power on all of the sudden . It worked fine almost daily since we bought it and suddenly wont power up. Tried powering from the remote, from the unit itself , disconnected from power for hours , nothing worked ! The only that happens is that I hear some faint clicking from the ONE CONNECT box, few clicks , then it stops it is as if the unit is trying to reboot but something is preventing it . One Connect cable is not kincked bent or anything . Best I can get from Samsung was an apointment with their ONLY authorized service provider in the ENTIRE MIAMI FL area ! ( I find that shocking ) . That Tech service has already cancelled the first apopointment , lets see of they will honor the next appt. ( I have very little faith at this point given everything I am reading )
I've same issue.
Q7FN + xbox one x (with orginal hdmi cable form xbox)
Everything was fine for 4 months till firmware update in may. When tv is on game mode, it keeps crashing / restarting. Samsung already send me service, they change one connect cable and it solved issue for 1-2 months, but few days ago my tv again start restarting on game mode.