Personally, I am not seeing any problems with sleep, cold boot (after power was cut), warm boot (shut down, then turned on later). I have the Windows "fast startup" setting in Power Settings disabled (just in case it makes a difference for boot type).
PRIME X299-DELUXE II (BIOS: 3006)
G.Skill F4-3466C16Q-64GTZKK (XMP: on, no manual adjustments)
Please note, the RAM in use is listed in QVL.
He who invokes history is always secure.
The dead will not rise to witness against him.
You can accuse them of any deeds you like.
Their reply will always be silence.