My friend and I have been playing for about 12 hours or so together, and after some time I began to lag significantly. This continued for a few minutes, before I was kicked, sending me back to the main menu.
I attempted to rejoin his game, which began to work as expected - loading in the map, tech, etc. However, before I was able to move, my character was killed by nothing. Just standing, about to resume control, and I died.
The respawn screen showed and began loading me back in, but I was then kicked to the main menu with the error message "Outgoing Reliable Buffer Overflow", and I'm unable to attempt to rejoin his game.