Yep that's the mobo of my NCase build.
No problem to check, but how should I know?
Maybe I already have a clue.
I had to ask the Asrock support because the light on my USB hub (USB powered only) was still on even when the computer was off.
They pointed me to the Chipset option in the BIOS where I had to enable Deep Sleep for S4 and S5, which worked fine!
Apart from that, this board is behaving strangely... it sort of resets itself each time I unplug the PSU from the wall. 'Sort of' because the BIOS is reset but the setups I saved are still available. So I have to load one and I'm good to go again.
I changed the CMOS battery but that didn't do any better.
I think I also checked if it was a side effect of the S4/S5 being enabled, but it wasn't from what I recall.
Let me know if such strange thing happens to you also.