if we use ie <internet options> and after go in to <connections> <lan settings>
and anable <use automatic conf script> and in to adress wrote your <ip> and the problem will be solvet
I'll quote you something from admin panel to explain why this happens:
Session Timeout
This is the time in seconds that a user must remain inactive before their login session expires. This setting also controls how long a user will remain on Who's Online after their last activity.
