Need help fixing my game

[Bergen]

For the past 3 of 4 weeks day of defeat source has been closing by itself without warning or error message, and i am wondering what is going on, it can't be my graphics card cause that's brand new and so is my computer so i don't know what else to do to fix this problem and it is very annoying and keeping from wanting to play any games, PLEASE HELP.

 

[ChocolateVillain]

https://support.steampowered.com/kb_article.php?ref=7241-EYON-2343

Fixes about half the problems that arise with Dods, Css, and Tf2