I think it's a BIOS or AMD related problem (it is good that bios updates are quite often, so maybe in 3-5 years the problem will be solved).I've already given up. I will leave it as it is. The worst part is that Asus tech support doesn't want to help...

RedSector73 wrote:That is not showing qcode error that normal operation cycle through then off to windows OS with qcode showing. If it stops on a qcode or resets by itself after a qcode but prior to handoff to the OS, that is a probelm.Do you have yo...

Next update:Bios 2304 has not resolved the cold start issue I have noticed that the problem with the cold start (after disconnecting from the power supply for the night) occurs when the XMP profile is enabled and the USB keyboard is disconnected. I ...

Next update:bios 2403 has NOT solved the problem I have noticed that the problem with the cold start (after disconnecting from the power supply for the night) occurs when the XMP profile is enabled and the USB keyboard is disconnected. I usually use...

In my case the new bios 2403 (not 2604) has solved the problem. Before that only timings 19-22-22 at 3600mhz did not cause the cold boot issue.