Apache misbehavior

I don\’t know what is going on wrong with my Apache server for the past couple of weeks. It is slowly increasing the usage of CPU and ends up with 99% of CPU time making system slow. If I stop it, I can steel see some processes alive and I need to use kill -9 to remove them since even killall is not working. After restart the CPU usage is ok, but slowly increasing and I end up with the same 99% in a day period.

Trying to find what is wrong, but can\’t. Logs seem to be ok.

If anyone has at least an idea – share it in comments because I am too tired of watching and restarting the service all the time.