Since U41 on EU PC there has been an issue where leaving the house can cause an endless loading screen.
What happens is that when a player goes into a house, uses an aetherial well and then tries to leave the house they get stuck in an endless loading screen. The other players in the group will almost immediately see that player as offline, but for the player that has the loading screen the wheel keeps spinning. The only way to get out of the loading screen at that point is to close the window with task manager.
It doesn't seem to matter if you're porting to another player, directly to the trial, another zone, or try to leave the house by using the door.
We've noticed it when doing trials, and haven't tried to see if it can happen when leaving the house without using the aetherial well. It's more obvious when doing mini trials simply because you use the well so often, but it doesn't seem to matter which trial you're doing. It does seem to happen regardless of which house it is or if the house is yours or not. We've tried disabling addons and it made no difference.
How often it happens is not consistent. For example it happened to me and maybe 3 others in the group 4 times in a row, and then it didn't happen to anyone in the group for an additional 5 times etc.