my game crashes every time i go on a server for mor than 30 seconds

Put the summary of the bug you're having here
every time i go on a server for more than 30 seconds it crashes

What I expected to happen was...:
Describe what you thought should happen here
me to play and have fun
What actually happened was...:
Describe what happened here
i crash every time
Steps to Reproduce:
1.go on the server lost mines
2. wait 30 seconds
3. game crashes and i flip out