Every time I try to get into a server for example mineplex I stay on the server for about 30 seconds then my game crashs, this happens on every server. The only time my game doesnt crash is when i play single player

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What I expected to happen was...:
Describe what you thought should happen here
I Expected to play minecraft with no problems
What actually happened was...: My game crashes
Describe what happened here
My game crashes
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...