This issue happens after a couple of minutes of normal gameplay. Randomly you are unable to open chests, open inventory or collect resources. When this happens the game will crash within a 15 seconds and kick you from the world.

When you rejoin the realm you will be reverted back to the old save.

Sometimes you are unable to join the realm at all.

It seems to get stuck on the "gathering resources" screen but won't go any further.

This issues seems to resolve itself. We have been waiting around an hour and then trying to rejoin. This seems to work and we are able to rejoin.

Unfortunately for a realm that we pay for it isn't an ideal situation.