Fortunately or unfortunately I hadn't blue screens on my attempts today, but I made a interesting observation. I played four times with different graphics config, highest, between highest and default, default and lowest. On highest and lowest the game froze very fast, after 5-10 min of play, and during flight. Between highest and default, it took about 30 min to freeze and with default (except fullscreen and 1366x768 res) it took 60-90 min to freeze, both while building. The "The game 'disappear and reappear again', like it had been minimized and maximized alone." problem stopped. Another important note is that it never froze during tutorials (made up to docking), but they were made near default graphics config. The blue screens happened about 3x and I have already about 20-25 freezes. Two occured when I was able to end the game but KSP.exe kept running on the background. One happened when I was trying to restart my system and other after some hours on stand by, about 3h. The one that happened during the game was the first, the game recovered for a couple of seconds then the blue screen appeared.