Whenever I log into a multiplayer server I play for like 5 minutes and then minecraft closes and shows me a crash report

Put the summary of the bug you're having here

What I expected to happen was...:
that I expected my minecraft game to work fine without crashing

What actually happened was...:
Whenever I log into a multiplayer server I play for like 5 minutes and then minecraft closes and shows me a crash report

Steps to Reproduce:
1. I logged into minecraft through minecraft launcher 1.3.7
2. I go into multiplayer
3. I go into any server(Ive tried all the servers I have)
4. I am playing on a game for a few minutes
5. Then the game crashes and it gives me a crash report