Please check the cpu load on your avalon. It is near 80% on my 3 module avalon and it can be 100% on a 4 module. If so, then thats the problem. The cpu is to tiny on the wrt board. If you realy want to use p2pool, then connect the avalon controller usb cable (remove Jumper J1 on the controller board) to a PC/Notebook and run cgminer on it. Everything is controlled by cgminer eg. fans, clocking etc.