Random quitting on single player

[Hazmat]

When I log into single player I can build for a few minutes but then it quits out. When i put my own server if i don't do anything until someone gets on it's fine there are no quits but if I do anything then there's a certain amount of before it quits. I'll get my console when i can.

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[Shell]

Can you run Blockland?

[Hazmat]

yea i just can't build in single player. A friend and I are working on a massive project and i can't work on it unless he's on my server.