Asus Strix x870 A Gaming Wifi Motherboard Loosing M.2 on reboots randomly.

[contagous]

 I recently upgraded to AM5 from AM4 using the following parts: 

Asus Strix x870 A Gaming Wifi Motherboard (BIOS Version 1605)
AMD Ryzen 9 9900x
64 GB DDR 5 (o'c stable at 6400/3200/2333)
Nvidia 3090 (brought over from the old system until I get better)|
Seasonic Vertex 1200W

I have 3 m2. drives and 1 SATA drive

Gen5 Sabrent Rocket 5 in M2_1
Gen 4 Sabrent Rockets in M2_3 and M2_4

None are in the sharing lanes as far as I can tell by the Mobo Manual.

And randomly, the Rocket 4s (either one or both) are disconnecting on reboots (soft reboots) or when computer updates and reboots, and I normally have to power my system fully, and then when I power it back on, the drives show up again.  (they drop from BIOS and Windows)

I am not undervolting my CPU as that's when I first noticed issues, so nothing crazy, only the o'cd ram, which is stable other than maybe the M2. issue. I do undervolt my GPU, but that shouldn't be affecting anything.

Is anyone still seeing these types of issues, and possibly has an idea for me to fix them?

Thanks to anyone in advance.

[contagous]

Currently updating to 1701 BIOS as was just released but any ideas would be helpful. 

thanks

[contagous]

160+ views and no one has any information? 

Is no one seeing this issue with this board anywhere?

[Silent_Scone]

Hi @contagous 
Have you ruled out instability? Try disabling EXPO for example, that would definitely be the first port of call.

[contagous]

At this point I'm currently just dealing with the reboot issue as everything is stable when it's online and I wanted the EXPO lol.

I've played many games, ran many diagnostics and created many 3D prints and graphics etc with zero issues. 

so kind of ignoring the reboot issue atm, but will test that when I get a second. 

thanks