NVMe drive disappears after power reboot

[Boomish69]

I installed an NVMe drive thanks to the wonderful help of this thread on MAcRumours- https://forums.macrumors.com/threads/mac-pro-best-drive-configuration.2006863/
But my NVMe drive doesn't boot after the Mac pro is powered down and back on, I can get it back via disabling SIP and running kext utility, or sometimes just by disabling SIP.

I've searched but found no solution anyone seen this or got an idea's why it's loosing itself?

Appreciate any help ..

 

[bsbeamer]

what drive are you using?

 

[Boomish69]

Ahh yes that would be helpful, a Samsung 960 EVO M.2 together with a Lycom PCIE DT-129.
it works great but not sure why it disappears if I power off the Mac..it remains if I reboot.