Chenbro SR301 - 4 bay Mini-ITX NAS - Seller accepts $90 offers, free shipping

Anybody having reboot issues?
I am having a reboot issue with Supermicro X11SCV-Q motherboard.
Has to do with the PSU, but why/how eludes me.

With the FSP250 that came with the Chenbro chassis:
Reboots suddenly when accessing NVMe (same time or shortly after starting read/write)
Seems to be stable when booted from USB or SATA

With an old Dell NPS-250 PSU I had lying around:
No reboots (yet)

With a brand new EVGA 750
Reboots suddenly & randomly, doesn’t finish boot of anything

Before swapping PSUs, I previously swapped out every single other component: NVMe, mobo, CPU, RAM.
The only thing that stopped the reboots was my old salvage power supply, which I don’t want to use because the fan is noisy and annoying.

Any suggestions would be greatly appreciated.

Cross-posted this in the mobo thread:

Now I am wondering if it has to do with grounding?
I am doing my build & debug outside the case, and noticed while replacing the PSU that is has the additional grounding wire as part of the power cable jumper.
Could that have something to do with it?