Comment 766 for bug 1690085

(In reply to Ashesh Ambasta from comment #680)
> I've been facing the same issue since I've bought this machine and setting
> my BIOS power settings to "Typical current idle" has only partially fixed
> things (the system still crashes every 1-2 weeks during idle: I leave my
> desk, screensaver fires up, then screens go to sleep, and by the time I get
> back to my desk, the system no longer responds to any input and the only
> option is a hard reset.).
>
> At the time of writing, I can't tell if the AGESA version has made it into
> my motherboard: https://www.asrock.com/mb/AMD/X399M%20Taichi/index.asp#BIOS
>
> But I'd be willing to give this a try. I also just yesterday requested an
> RMA from AMD though: I spoke to their support and they asked me to try
> setting the power settings in the BIOS settings. Once I reported back that
> the power settings only reduced the frequency of these crashes, their
> immediate response was to open an RMA request. It seemed like they were
> aware of the issue and they seemed quite confident that an RMA will fix this
> (I sure hope so since the RMA means at least 2 weeks of downtime for me).

I wish you luck. I think this is all I can tell you.
I had exact problem with B450. I have opened RMA request and got money back. I bought X570 based motherboard and this solved issue for me.