I'm running a dedicated server on a commerical game host (First Nodecraft, and later Gamebros). I can connect and play the server fine, and so can some other people. However, there is one player that has a very low rate of being able to join the server. They will sometimes be able to join after a ...

No, I haven't been able to reproduce it.

I don't remember exactly what I did, but I was working with blueprints and pipes, and the game crashed.