I see the other long thread about this was locked so I'm posting this since I still have the problem albeit just once in Apex Legends since driver 20.4.2. My display suddenly goes black and I can hear the audio keeps going for 15 seconds or so then that goes away to and after a bit longer the computer restarts itself. The other day I was gaming fine for over two hours with no problems, so it's pretty random.
I've tried turning off all extra feature such as Radeon Anti-Lag, Radeon Enhanced Sync etc.
Bellow is my system info (a bit different since it's a Mac, but it's still mostly Intel based stuff inside, i.e. more or less like a Windows PC from 2010 except for the Xeon type processors):
AMD Graphics Card
Gigabyte RX 5700 XT Gaming OC
Windows 10 64bit 1909 (all current Windows updates installed)
Adrenalin 2020 Edition 20.4.2
Apple Cinema Display 23" 1920 x 1200@60Hz with DP to DVI adapter from HP.
Motherboard + Bios Revision
Apple Mac Pro (Mid 2010), BootROM 22.214.171.124.0 (latest)
6 Core Intel Xeon W3680
980 Watts Apple Power Supply
32 GB DDR3