Continual Realms crashes with varying error messages

Realms continually crashes (forced disconnection) and each time, it appears to display a different error message - see attached images. I can reconnect after each disconnection, but it very often crashes multiple times in a row before finally letting me connect to the world properly (i.e displays "joining world", and before the UI or the game actually loads in, it will have crashed). There is no consistency with when this occurs (i.e what is going on in the game at the time)  or with what the error message says when specific things happen. I am unsure whether this is a game problem or a computer problem, though this issue was not present prior to 1.16.4 and my system has not changed. Thank you.