Q:
Random disconnection after story mission
I’ve been having this issue as well, for roughly the same period of time. It has occurred on multiple characters and across personal, living, and Heart of Thorns story instances. It always seems to happen towards the end of an instance, as Venumpty stated. I spent a few long periods in a story instance the other day, working in one area to complete an achievement. I didn’t get kicked at all, though I was also not progressing the story at the time and the achievement took place towards the first part of the instance.
If you only get disconnected in the story, try running the game on port 80 or 443, or use a VPN:
Gw2.exe -clientport 80
(I know this is not a problem with my router because it has happened the exact same way 3 times at different times as well).
It’s probably not a problem with your router, but that doesn’t mean it’s not. Your router could be killing connections that match a certain packet sequence for example, which is going to cause you to disconnect every time something specific happens. This is far more likely to be caused by your ISP however, since they may be trying to throttle certain types of traffic and something in GW2 just happens to match. This is where port 80 or 443 may help, or using a VPN to encrypt the connection.