Hey Manish,
Really appreciated your effort to give a solution, i have already checked those threads , but my real issue is not session timeout.
If you can go through my post again, I have mentioned "after successful login and entering into "Datalocker" application user sometimes automatically gets redirected to logout screen and doesn't have values in its Client.username and GetuserId() function even after 5-10 min of activity. "
So the issue is random/abrupt logging out of the application even after 5-10 min of successful login.
Hope you are getting it.
Here is my current error log screen looking like when working on application .
