Gmod Crashing.

I have a problem…I can play multiplayer fine on a few servers, but when I’m tired of that server I leave and join another. But the thing is, I can’t. I could before, but not anymore after the updates…After downloading all the files on the server I want to join, it crashes. When I try to get on singleplayer, Gmod also crashes. Please help, I’m tired of playing on the same server for a month.