I have been getting random reboots with Ryzen 5 (Cezanne), B550M DS3H, and corsair vengeance ram.
Symtoms is that screens simply go black, tower LED light for power doesnt even turn off, then POST starts. no logs from linux mint system here so I dont know. It had happened on live usb boot tests also.
I have tested with lot of stuff but everything seems to be fine. ram has been memtested all night on single sticks and as pair. PSU have been replaced for test and returned. 550w is plenty when it barely uses it, using 3-20% load.
I'm concerned with number of MSI b550m reboot random posts, as well as cpu/ran compatibility posts also. I can't really afford to just randomly swap parts.