[Pierre-Marie Baty]

It's a network problem. The game sent too much information in one single frame to a particular client and the client didn't empty his buffer soon enough, and some frames which were flagged as important were lost, thus leading to the engine giving up.

perhaps you have too many bots/too many waypoints/too many sprites to display/too many entities/too many lights/too many whatever stuff that would have to be reset all at once at round restart and your listenserver couldn't handle them all.