File increase image.php is causing server to hang

Hello all,

I have been using WP for almost a year and I have a news blog site with a theplanet dedicated server.

The site has increased a lot, but recently at least once a week the server stops responding, the guys at TP told us that from one of our IPs a file is being increased using image.php

I would like to know if someone else has experience this.

Everything at the WP site is up to date.

Thanks in advanced.