I get something like this too.
Every 20 mins or so the game will freeze and I get the "disconnecting in 29, 28, 27...." in the top right. When this reaches about 25 it will go away and I'll be left with all players frozen where they were before the lag, then about 20 seconds later the game will unfreeze (usually back at spawn after being lag killed).
Happened before the multicore update too, ever since the scout update.