I know and I agree with you - the thought of having paid so much (and those of us living here in HK do pay more because the retailers generally do not have a large number of this range of product in stock) for a supposedly high-end product, but having to worry about it dying each time I turn on my PC is not ideal at all.
Before I stumbled upon the "solution", I had tried everything and deduced that the monitor itself is probably working fine, because I could use it using HDMI with no problems - other than it being stuck at 24Hz which defeats the point of me investing in SLI!
It was when I found Googled "monitor cannot defect DP signal" that I decided to change the Windows power option.
So, all things considered, my deduction so far (and really I am hoping) is that the monitor is fine, and it could be because (1) my power supply does not consistenly produce enough voltage to ensure my video card can deliver a strong enough signal (which kind of makes sense but it also sounds like rubbish), or (2) worse yet, my apartment's power supply is not strong enough to supply enough voltage.
Anyway, yes I do agree there is a conspicuous absence of a dedicated ASUS tech support expert to address our queries. I used to had questions to relating to my ASUS motherboard and fan speed, but the ROG forums over there received much more attention and prompt feedback from ASUS.