To drop in my own 2 cents, for me the issue started occurring about the same time the insane lag spikes in LWS4, PoF and IBS maps started happening (about early 2020). It is almost always limited to 3 scenarios for me:
- End of a story instance, when the game is supposed to switch to a cutscene or the reward popup
- End of a PvP match
- End of a Fractal
As you see it's basically exclusively tied to instanced content and always code 7:11:3:202:101. I created firewall exceptions for Gw2-64.exe , enabled port forwarding for ports 80, 443, 6112, nothing seems to make a difference.