Mjrat, just in case reinstalling doesn't solve the issue. If your computer shuts down suddenly (no shutting down sequence, just turns off). Your computer may be overheating or may have power supply issues. So if you are still experiencing problems after re-installing the game, you might want to try cleaning the insides of your computer a bit and/or get someone to check it out for you.
Regarding your other issue, ignore and keep playing, for all you know, even if you don't win:
Hell, I stopped caring about anything keyboard warriors say a long time ago. If they wanna laugh, let them laugh, cause I know for sure they rage like hell when they get that one death which stops them from reaching "Captaind*ckwad is unbeatable!"
See you in game.