i've tried playing this mission a couple of time today, started fine, then just after the assault bots arrive the bots stop doing anything then then the game stops with 'Server connection lost'. I played the same mission yesterday without any problems (other than I died!).

Sounds more like your network is having issues than anything to do with the mission... try looking for possible network problems on your end.

It happened just around when the tycorps arrive, though it seemed be happening again, just before i died again now. The bots stopped shooting and i couldn't seem to hit them properly.