Black Barya Portal causing unexpected disconnect

I opened a Black Barya encounter (first one of the league for me, in case that matters), clicked on the portal and went into the encounter just fine.

I died, and when I respawned on my hideout and clicked on the second portal, I got disconnected with a "Unknwon disconnection error". Invited a friend and he had the same happen to him.

I recorded the interaction and I have attached the video: https://youtu.be/gMlNaY4bbKg[\url]

This has been happening in all boss areas for me now: Sirus Originator map (only when he is active), Elder Guardian map but only when trying to enter the arena of the guardian (see clip: https://youtu.be/LJCBiLINqEc ), Black Barya... Haven't been able to test a Conqueror map yet

It hasn't happened on Maven invitations, nor in any regular map.