I have the excact same issues with my main char since 2 days, i did not test my other chars. Playing on ps5, provider is Vodafone, Northern Germany, there were no changes in my setup beforehand. I use dc travel a lot for hunts, so it is really annoying, but I can´t really see a patern with my errors, they appear at the endwalker screen when it is trying to find a connection and after a long loading screen after world queue. Sometimes up to three errors in a row at the same point, other time first try. It does not matter where i logged out or if i switch from light or chaos.
I reinstalled ffxiv, resetted router and every diagnosis is fine.