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I using drupal about 4 months everything work fine until I facing this annoying problem
my site turn offline by itself (operating in offline mode) and It logged out by itself (operating in online mode) and sometime I cannot even login
the problem occured randomly but I noticed that It's tend to occur when I tried to heavier things like rebuilt permission , see database logging (admin/settings/logging/dblog),use any ajax function in View Module,etc
I figure out why it happened , Is it involved to session/cookie or not ?
what I done is enabled $cookie_domain='mysite.com' in settings.php but the problem still exist.
It's very critical problem to me (since I found)
I've tried tons of solution (Clear drupal cache,Clear browser cache,delete cookies..) in this site but still no luck
MY SYSTEMS (on shared hosting) :
#Edit2 : add more information
Please someone can advice me an idea to do,
any suggestions would be much appreciated
ps. sorry for my english.