disabling C1E/C States in bios solved the issue...
Hello. Our server (PowerEdge R620, Windows 2012R2) randomly reboots:   Sun Jan 30 2022 11:40:06 A bus fatal error was detected on a component at bus 0 device 3 function 0.Sun Jan 30 2022 11:40:06 A bus fatal error was detected on a component at slot 3.   What I did 1) X-test FC cards multiple times -server has 2 FC cards (QLogic QLE2660) 2) updated firmware to latest version (15.15.06) 3) motheboard, raiser,  was also replaced   Any suggestions?  
A bus fatal error was detected, PowerEdge R620 , QLogic QLE2660