So, 5 months on, and this issue still plagues me. Is there any detailed information about what exactly this Q-code means? I cannot cold boot my computer in the morning (after it's been off all night) without this damn q-code 55 repeating itself 20+ ...

Did some tweaking to my Ryzen 7 overclock this morning. Changed to pstate overclocking, and also bumped my 3000mhz Corsair LPX to 3200mhz by loosening timings.I've discovered that after doing this, I now randomly hear the "USB device connected" sound...