Exit code -805306369
This exit code is caused when the client runs out of memory.
This can be caused by the JVM not being allocated enough memory, a bug in the game, using client modifications or a dependency of the game that has unexpectedly terminated.
How to fix this
- See this article on instructions to allocate more memory.
- Run an ADWCleaner scan
- Run a Malwarebytes scan
- Reinstall minecraft to ensure you have no client mods.
- Check your System Event Log for issues.