Asus Prime Z390-A False Start With Updated BIOS

Hey guys,

I recently built a new PC with an Asus Prime Z390-a and I have been getting a false start but only with certain BIOS versions and only after I unplug my system. The false start will not happen if I leave the system plugged in after a shutdown. I have tried changing power supplies, booting bare minimum (CPU, RAM, PSU) and there is nothing I can do to fix it other than revert to an old BIOS. There have been 4 BIOS versions in total for this board, 0224(first), 0402(release), 0506 and 0602(latest). The false start only occurs when either BIOS 0506 or 0602 are installed. Asus support hasn't been helpful, and it's been 48 hours since their last response. So I figured I'd come here to get some input from you guys to see if I should just RMA right away, or if this is a BIOS fault then I'd stick to an old one for now and wait until they release a newer one.

My system specs are:
Asus Z390-a
Intel i7 8700k
G.Skill TridentZ 4*8GB 3200MHz
EVGA Supernova G3 850w
EVGA GTX 1080 ti SC2 Elite
Samsung EVO 970 250GB m.2
Samsung EVO 860 1TB m.2
Phanteks Enthoo Pro M SE
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  1. After more research I figured out it's called a "double boot"? Where it turns on for a second, then off for a few seconds, then back on and proceeds to post normal.
    I have gotten multiple responses back from Asus, each from a different person, and nobody can give me a clear answer whether this is supposed to happen or not.
    A few representatives have told me to RMA it. So that's what I did. But isn't it true that if Newegg finds nothing wrong with it they will charge me extra money or something?
    At this point I'm thinking it's a new feature they added to the latest bios versions, and my RMA will have been for nothing. But any input from you guys is greatly appreciated.
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