Hey I just want to pitch in that there's a ton of people on Reddit that's having this exact same issue including myself that's occurring just after Dawntrail pre-release.
Reinstalled all drivers and everything. I have a 4070Ti with 7800x3D and easily get 120 fps+ on 4k max resolution. Even after scaling down to 1440p and capping my 200+ fps to just 60 it's still freezing. Probably not much help because I'm not posting my log, but you should know you're not alone in receiving this issue.