I loaded up a server with 10 bots. Turned off the AFK kick from the HLDS console and went to bed... woke up 5 hours later and I see this message which I saw a couple times before but now sure what it means.

SZ_GetSpace: Overflow on netchan->message

...and still losing bots over time. This time I've only lost 5 in 5 hours

I've gone to two other servers that use the Realbot build 3005. Is that one more reliable than the latest and greatest builds?

Terrorisit bots are kickass, the CT's .... well they like to hang around spawn point on maps like de_dust2 and a couple others they seem to like to run around and do their thing. /shrug