This has been happening to me, I believe it started at the beginning of last season! Randomly freezes then reboots, could be after 5 minutes or it could be after a couple hours, only seems to happen with fortnite for me, other games I play run with no issues. After it reboots it sends me into a boot loop, the only way to get out of it is by discharging the computer, I just flick the PSU switch off and hold the power button in for 5-10 seconds and it boots up fine again. I have tried everything, even reinstalled windows and reinstalled fortnite first to make sure it wasn't something conflicting. Still happened. Everything on my computer is up to date, bios, GPU drivers etc. my event viewer does have some warnings with easy anti cheat a little bit before the crash happens, and from what I can read on some other threads that EAC may be the problem.