You should be able to see the specs for my machine...it's in my profile. Anyway, up until now, I've been blaming the AMD Vega Frontier Edition video card for the lockups & freezes (seems to appear under gaming loads); however, the peculiarity of surrounding said freeze, whereby I reboot, and the machine instantly tries to, I guess, retrain the RAM (when I've already dialed in the settings, manually) is bothersome. It reboots several times, trying different RAM configurations...until it boots (at the lowest), then I enter the BIOS, save & quit with the proper settings, and it reboots fine. Also works fine from a cold start, provided it hasn't frozen immediately beforehand.
The machine otherwise will run rock solid for days on end.
And I can't use the latest C6H BIOS, because I have the WiFi edition, and I haven't even seen a beta for that.