MBP 13 retina late 2012 - display problems with wifi

Hello!
I writing you about a problem i'm having since i bought my MBP retina in October 2012 but now that i'm in Russia is really worring me. I've been in a Genius Bar back at home in Italy but i couldn't show them the problem with the display because it was very occasionally and it never happened while i was in the apple shop. The apple genius run a kind of testing program and apparently my mac is ok. Now i also know that this problem happens only when the wifi is on. The display is flicking ( i hope this is the correct word) and actually it was just rarely in italy but since i'm in russia i can't use my mac while i'm connected because this problem is constant and much much stroger.
I noticed that the only way to stop this problem is to make a bridge with my finger from the alluminium chassis of the mbp to the black part at the bottom of the display. If i do this the flickering stops. So i'm somehow thinking it is an electric problem, and maybe in russia there is a different tension in the electricity or something else that makes this problem bigger.
I will also traveling for the next 5 months and so i can't bring my laptop to an apple store in italy. I don't know if i can bring it to another apple store around the world to fix the problem, and i don't know if i will have a 2 years warranty like i have in italy.
I'm very angry with the genius i've been in italy because he didn't believe my problem and he didn't investigate further. I was there in April or May and i still had the first year warranty. Now i'm traveling for the next 5 months and i super need my mac because i'm a travel blogger and as u can understand it is very important for me.
I hope someone can help me.
Thank you
Dan

thanks! yeah i recorded it so i hope they will take the problem more seriously.
Unfortunately i don't have an applecare protection plan, but i hope that the proof that i've been in an apple store for the same issue already in april will help me somehow.
I also think that when i touch with my hand both chassis and display i make some connection working again. Maybe i'm the radioactive man, or i have some special powers...or for the first time time in my life i bought a bugged apple product. But i think is more possible one of the first two options!

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