WD Elements 107C is not shutting down anymore

Hi there,
since a few days my external hard drive is not shutting down when I turn my PC off. The thing is that the drive had no problems on my old PC. There I had an ASRock 960GM-GS3 FX mainboard, and now I have a new ASRock Z170 Extreme 6+. The S.M.A.R.T. values are all green and the drive causes no other problems. I have also disabled the WakeON functions in my BIOS and the energy settings of my OS(Windows 10 Pro x64). Now I’m afraid that the drive could be damaged, because it is almost 2 years old.

I hope that anyone has an clue what the problem is about.
Thanks for your time.

Hi, if you turn off you computer and connect lets say a Phone, do you see if it start charging? I had a motherboard on my gaming computer that use to provide energy to the USB ports even if it was off.