My hostgator account is suspended due to too much cpu usage!

I had the account up and running for just over a month and there cannot be that much of traffic.

They gave me a list of URL which are mostly in my image folder. The image file sizes are not that big at all.

Have anybody report similar problems? I do not thnik i have that much traffic. So I do not think I should upgrade to a dedicated server. If zen cart causes the problem, even upgrading to the next level is not going to solve the problem.

Please help.

Thanks
w2e