F10a for X670E Master is on their servers now. I just flashed it cause.. what I have to lose. Any AM5 BIOS is a mess
it's AGESA 1.0.0.6 btw

Yes I do have the same problems. to me it only happens for the first 3 -5 boots, then everything is working absolutely fine for whatever reason. Anyway, you're defintely not alone with those problems. I can confirm and I have all 4 M.2 slots in use. I haven't tried, but I think when not using all M.2...

whoops, totally forget to mention the model.. X670E Master I was talking about. Anyway, BIOS F9 seem to have the same problems as F9c even worse for me, cause now I regulary loose my LAN port all of the sudden in windows, then I have to reboot to make it usable again.
It's still AGESA 1.0.0.5...

seems like F9 is final now. It's laying on their servers but not on official website yet. Anyway, I just flashed it. Lets see if this one is actual usable.
First thing I noticed is that we have high res on boot screen now lol.

Gigabyte really knows where the priorities are /s...

Took me 2 reboots to encounter the first BSOD with X670E Master F9c BIOS. I am really getting pissed at this point. Yea I know this one is actually beta but F8 doesnt work any better for me either. AM5 is just an unfinished platform EVEN 5 months after release.

Yea, I can confirm and can only repeat myself:
when I start up my PC the first time on that day, it will be totally unstable, will sooner or later freeze completely, be unresponsive, super laagy and the ethernet port will loose its connection or rather the whole device in windows at some point....

I am note 100%,since I'd have to test that but I can definitely tell you that I have that exact problem you describe since I put M.2 in all of the 4 slots. So it must has something to do with m2 drives. My system has like a 20% chance to boot without problems but most of the time it boots and everything...

F8 seems to be final now for X670E Master, but it for sure does not feel like. Didn't take me 10minutes until I've heard that windows "device connected/disconnected" sound over and over again. then I rebooted and its gone now, but too early to judge. F8 still seems not finished though.

yea.. unfortunately I can confirm some of that as well.
Weirldy though it feels like the first cold boot only causes these problems therefore when I boot up my computer the first time after it was completely shut off I go into bios, shut it off again, start it again and then none if these problems...

You really should give F8h a try. So far I haven't had a single issue with newest F8h
Either F8c and F8g caused issues within first half an hour after flash already.

F8h looks promising so far....