sudden crash

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my game suddenly crashed as i was playing. It is a completely unmodified game and running version 1.8.1. I also had trouble with servers timing out often. This is a first and i think it could be my wifi, but if it isn't then i might as well let you look into it just in case.
What I expected to happen was...:
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What actually happened was...:
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Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
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