Could be many reasons, security on your server, chmod incorrectly of certain files, insecure mods, there are more obvious ones
I would right at this time disable your mods via your config.php and .htaccess your mod cp & admincp to just your IP address.
Without logs or more information I'm not sure what else anyone can do for you.
Oh and back up daily ............. or in your case right now back up hourly :P
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