Wow, I’m so relieved I’ve seen this thread!
I bought a new WD black drive 2 weeks ago, and the drive not being detected after a restart was driving me nuts!
I almost bought a new PSU because of this.
I have 3 more WD black drives - All WD2003FZEX-00Z4AS0, and they all work perfectly - detected all the time.
Only this one WD2003FZEX-00SRLA0 is almost never detected after a restart, only after shutdown.
My motherboard is Asus Z170 Pro Gaming with the latest bios firmware.
As I see there is no attention here in this thread from WD staff for over a month, I’ll also open a support ticket, to find out what should I do about this.