Hello, I assembled a system on a Ryzen 7 5800x/B550 motherboard (B550 AORUS Elite V2), gpu is RTX 3070 Aorus Master, I have had problems with usb ports failing for a long time, namely a keyboard and a hub with coolers for blowing the case (the hub is connected to the motherboard (F_USB2), keyboard into the back panel (both usb 2.0 connectors)), probably many here have also heard about this problem with the 5000 Ryzen. I tried everything that was advised to those who have similar problems (updating drivers on chipset/BIOS (now there is the latest BIOS (F13h) with 184.108.40.206 AGESA), with a default BIOS, XMP on/off, XHCI\C-State\CSM on/off, pci 4.0 to 3.0) - in my case it had absolutely no effect.
A couple of days ago, I realized that the problem is only in the system in an idle state/light load (chrome, watching YouTube in it, etc.), but as soon as I start a heavy game (AC Valhalla in my case), the malfunctioning usb starts working, the keyboard stops glitching , and the illumination of the coolers starts to work as it should (for people with a similar problem, basically the opposite, as I understand it, but I may be wrong), while there are characteristic sounds of connecting a USB device.
Once i had defeated the problem, but unfortunately I did not remember the procedure for the elimination steps, I remembered only that at that time, from the last released BIOS, it was stitched on the penultimate one (at the same time I remember that I seemed to turn off the PC completely at some point) and after that the problem disappeared, everything worked as it should, but there was a need to rearrange the PC and after I turned off the power, transferred it and turned on the computer, there was again a problem with USB failures, which this time cannot be cured at all (I tried to do everything the same as that time when there problem was eliminated - no use now).
Could the problem be with the power supply? (be quiet! System Power 9 700W)
And is it worth to try another motherboard? (B550\X570
Supposingly AMD fixed the USB connectivity issue with new BIOS updates. But AMD says if you are still are having USB issues to open a AMD SERVICE REQUEST (Official AMD SUPPORT) and let them know about it from here: https://www.amd.com/en/support/contact-email-form