Constant disconnects from Purifier fight

Trying to finish Purifier under Maven influence, but every time during the fight I get disconnected:
2026/03/14 13:11:04 128065453 aecea4b6 [INFO Client 4156] Abnormal disconnect: An unexpected disconnection occurred.

and I can't ever reconnect to that arena, getting disconnected every time. Tried Canada, Washington DC if it helps.
Happened 3 times, still can't finish encounter, kinda ready to give up