I've had a few crashes, it seems like when a new round starts while the nodes/experience is being updated (especially on a map the bots just started learning) the server is more likely to crash. I had one instance where I had to delete the node/experience file for cs_iraq because the server would instantly crash whenever I switched to it. Deleting the rbn and rbx files solved the problem.

A suggestion regarding guarding the dropped bomb/bomb site/hostages:
Instead of having the bot camp right on the bomb, have them ask "if I am standing on the bomb (or hostages or whatever), where am I most likely to get killed from?" Then have the bot make a list of say the top 10 or 20 nodes, pick the safest of those nodes and go camp there, and look at the bomb and the main danger areas for the node he is on. If multiple bots are guarding something, they should never all choose the same node. If a node is "occupied" by a teammate, pick the next one down the list and go there. That's basically what I do when guarding the bomb or hostages or whatever, and it shouldn't be too hard to code that.