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9. I left it with 70% battery for 5 hours and came home and it was red hot and dead. In a city with no reception issues.

That's definitely a problem, but if it was the standard experience of GrapheneOS users, then GrapheneOS wouldn't have as many fans* as it seems to.

*Fans as in happy users, not fans as in blowing cool air over a red hot device

That's strange. Have you tried the stock OS and had the same problem?