What I do?
I'm in the same boat as you. I created a new user on my machine, just to play FAF. It normally works for a few weeks, then starts again. I made a new user profile when ever it happens. I'm actually on here, to try and find the cause, myself.
Is this your error message? You should post your game and client logs either way and list the mods you use. I used to get that error a lot which is why I have a screenshot handy, I seemed to be able to basically get rid of it by trimming down the size of my game.prefs file and stop using some of the more intense parts of some of my mods.
I made a post about it here: https://forum.faforever.com/topic/640/game-crashed-after-40-minutes
Any help is greatly appreciated.