i have csf v4.08 installed

every day i received many emails from server to tell me about ip's that blocked from csf firewall

i have 2 moderators in my forum
from time to other i received email from one of them tell me that he was blocked
after this i opening ip's that blocked, delete all ip's and restart csf

what can i do to solve this problem
i think if i waited more days it blocked all visitors csf blocked many ip every day