I didn`t want to say it`s a game problem, just pointing out for anybody who would have the same issue. I can confirm it`s probably the Win7 causing this - tried on another PC with Win7 but with a GeForce GTX 950 and have the same problem.
which directx do you use? I read that hd4000 has problems with Directx12 with the unity but I can not confirm anything the problem may not come from there