Something in Joomla is causing public_html folder permission to change from 750 into 777.
When this happens Internal Server Error is shown until I change permission back to 750.
My website is hosted on hostgator, VPS (level three) package
After website went live, during last month it happened 10ish times.
I wonder if something similar happened to any of you and how did you tracked the cause of this issue?
So far I created cron task to reset folder back to 750 every 5 minutes so that I dont need to monitor it 24/7 but I would like to sort this out.
Questions:
- is it possible to track what is changing root folder permission?
- is it possible to lock public_html folder into 750 so that nothing within it cannot change public_html folder permission?
Any help or hint is more than welcome

Regards
Joomla 1.7.5
Php 5.3.8
Other components installed which are heavily used by users and might cause this:
JomSocial
Ajax ShoutBox
jBolo chat
Simple gallery pro
jReviews
EasyBlog
thumbnailer
JCE editor (not available in frontend)