Same, sadly the guy that can fix this is probably eating Turkey Dinner with the family (which is well deserved).
Disconnected from Sever Reson: your Session Expired Yes... On Emerald, every 30min I get disconnected because of that...
It will only do that if there is no mouse or keyboard output from your end for more than 30 mins, the client system will automatically kick you out to reduce server lag or something.
For me had no lag and wasn't afk and got d/c session expire 5 times while in the middle of fighting after that quit and went to go watch a movie. But it did make me wonder if someone was flooding the server because it almost seem intentional. The platoon's i was with had people with the same issue. But it did stop after a few hours.