Keep crashing in Marathon, am no longer able to consistantly complete games

Almost every game I have played recently, and from today my last two, I have randomly lost server connection and lost all of my stuff. I will be playing, and then randomly I will lose server connection, then the game will freeze, and I need to restart my computer to get the game running again. Not an internet issue, I have used multiple different networks to resolve the issue, and none of it worked. I would really like my stuff back too.