DB sessions randomly logging users out

[eluser]WanWizard[/eluser]
There's a flaw in the design of the session library, which can cause this behaviour when you have multiple concurrent requests from the same browser, in combination with session id rotation.

To make sure this is not the problem, set 'sess_time_to_update' to something like 86400 * 365 ( a full year). This will prevent the id from rotating.

The underscore in the cookie name is mainly an IE problem, other browsers don't have an issue with it.