Hey altemose, miracle happened last night that made me cancel the genius bar appointment today.
Remember the MDP-DP cable? It had funky pixels when i connected my mac to the monitor. It turns out to be the thunderbolt or mac system's problem! not the cable or the monitor. How do I know that? Check out the link here:
http://www.macworld.co.uk/review/di...stency-viewsonics-big-screen-display-3464460/
please check the comment under the name "liu sam" I posted a question around 1 month ago and I forgot to check messages for a while. There was a guy who replied my message 5 days ago and provided an external link that solved the funky pixels issues with MDP-DP cable.
Apparently, there are some people out there who have the similar high res 27 inch non apple monitor setup and they have issues with the MDP-DP cable. I followed the instruction on a website and override the display system on my mac. Basically the code force the mac to display in SRGB mode which apple should have done at the first place...
So now I am connecting my mac with my external monitor via MDP-DP cable for few hours now and i havent got any random signal drops yet..i guess this time everytihng will be fixed.. I will keep monitoring this issue for few days and make sure it doesnt come back...
I will update in the next few days

Happy Easter Altemose