Every 2nd portal dc, last portal "Failed to join instance ... other side of the portal disconnected.

Multiple disconnects always ON loading screen or when clicking on portal (other side of portal disconnected), very pattern like - I had stable portal scarab on T17 ziggurat:
1. Entered 10+ times
2. Every EXACTLY 2nd entrance -> loading screen freeze -> disconnected from server
3. Login screen
4. Back to hideout
5. Enter map again -> this time succeed, really 100% of 2nd retry enters map
6. Last portal stuck on error "failed to join instance because: other side of the portal disconnected.".

Region: Paris EU
Seems like a very very bad instance, super unstable, kept disconnecting but once I'm inside I usually managed to play, unless spike and die without seeing why.

EDIT:
Reference number: 3705126789
Bug command 2nd time after a few more failed attempts: 1552488904
Tried a few more times, now it's permanently the "other side of the portal disconnected" error.
Instance crash?

EDIT2:
Been 3-5 minutes - tried last portal again and again, until NOW suddenly entered map and connected, after 5 minutes of instance being "disconnected" while other areas work (hideout, town etc.).

EDIT3:
On and off, now stuck again on "other side of the portal disconnected".
I keeps switching between connect + fine, and dc during loading -> other side disconnected afterwards, for at least 5-10 minutes..
Another bug reference for more logs/info after trying further:
1772383127