Problem with Asus VG248/GPU

So about a month ago I bought Asus VG248  and it had worked flawlessly until couple days ago it started to do what the video shows. The screen might work without a problem for five hours straight and then suddenly it starts doing those random blackouts. These "seizures" last about 1 to 10 minutes. The other screen is working fine, so I don´t think its the gpu. Any ideas?