No Internet, Untangle needs to be rebooted every week to get back

What logs or where can I look to find out why I need to reboot my Untangle every week to get the Internet back? Every Monday or sometimes it makes it to Tuesday I get a call from client that they have no Internet, I can access the untangle login page from :4343 ( I am offsite) but can't log in. Once I have client reboot untangle Internet works for another week, I looked at bandwidth logs but looks like they get reset upon reboot.

Thanks!
INFO:
Build: 9.4.2~svn20130830r35759release9.4-1lenny
Kernel: 2.6.26-2-untangle-686
History: yes (23)
Reboots: 5 (2)