[SOLVED] Z590I AORUS ULTRA motherboard stopped detecting SAMSUNG 980 PRO SSD

[usaspiff]

I put a new PC together and it all worked fine for a month.
OS and game + files are all on a single SAMSUNG 980 PRO 500GB SSD.
Then one day my computer rebooted suddenly and the SSD was no longer detect in the BIOS.

I reinstalled the SSD to no avail. SSD was tested on another computer and works fine.
I sent the Z590I AORUS ULTRA motherboard to Gigabyte for inspection. They sent it back and when I put the computer back together, it worked fine once again.
Then a week later the same problem occurred.

I am thinking of sending the motherboard back once again and this time asking for a refund, and get a different motherboard altogether (like an ASRock Z590M-ITX/AX which has good reviews).

Before I do so, I'd like to know if I've overlooked anything.

Additional details:
BIOS updated to latest version (F5)
PC running stock, not OC. No abnormal temp detected.

Full specs:
CPU: Intel i5 11400F (Noctua NH-D9L cooler )
MOBO: GIGABYTE Z590I AORUS ULTRA LGA 1200 Intel Z590 Mini-ITX
RAM: CORSAIR Vengeance LPX 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 3200 (PC4
25600)
HD: SAMSUNG 980 PRO M.2 2280 500GB PCI-Express Gen 4.0 x4, NVMe 1.3c
Samsung V-NAND Internal Solid State Drive (SSD) MZ-V8P500B/AM
GPU: EVGA GeForce RTX 3060 XC GAMING

 

[usaspiff]

After more investigation, I discovered the PSU was dying and was probably not sending enough power to the motherboard.
A new PSU solved the problem.