I too have been having the exact same problem, playing on PS5. I've been seeing this issue ever since the start of June, right around when the Occult Crescent update was implemented. I had pinned my hopes on it being caused by my switch from a wired connection to wifi, but even after I've replaced my ethernet cable I'm afraid the issue is just as consistent and bothersome. It's strange - once I finally do manage to connect to the game, I have zero connection issues whatsoever, no lag, no rubberbanding during raids or busy fates, etc.