kloudkick

I recently upgraded from 5.x to V6.1.1 and everything was fine for several days. Today I started experiencing a spike in my server load every time I visit the client area. The site stalls and finally becomes unreachable until the server load subsides. I'm not having any problems accessing the admin area. - - - Updated - - - Also, server logs show the following process is using up a high amount of CPU: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 15710 kloudkic 20 0 70704 47m 6628 R 99.4 0.6 2:21.45 /usr/bin/php /home/kloudkick/public_html/portal/cart.php

Affiliate Monthly Referrals Report emails are being to sent to my customers every couple of minutes for about an hour each month. About 40 emails are being sent to each affiliate on the first of each month. What can I do to correct this? Thanks, Howard