Check the ammo and health cabinets, Do they look like whiskey bottles? If they do ... it is the dratted Irish bug, you'll have to kick one of the players, he's a wee-little fellow in funny dress....
In all seriousness What are the bots saying in the console? Are they spamming normal chatter-type messages or are they spamming error messages? Try condump-ing the console to a file when it happens. Did you install Nedd3h's attachment above? (it won't be compatible unless merged by a waypointer, so remove it)