I bought a computer in november 2015 and after a few days it started flickering. It seems to happen mostly when I use imgur/reddit (possibly because I spend a lot of time on those!) A timeline of the issue:
1) Did clean install under apple genius suggestion, still flickers
2) Replaced motherboard, still flickers
3) Replaced computer.
Even with the new computer the screen flickers. It looks like it's the upper half mostly, but it might just be how it looks to me.
The fact that replacing the motherboard didn't improve the flickering makes me think it might be a software issue, so I am hoping that with updates it'll stop. In the meantime I'll buy apple care...
Please share if you manage to figure out the problem.
Thanks!