1. Check that you do not have the "autologoff" settings checked in your LastPass Icon > Preferences.

2. If not, you may be clearing cookies between browser sessions, which you can verify following the steps at the top of the debug page: https://lastpass.com/debug.php.

3. If you have multifactor authentication enabled, you will automatically be prompted between browser sessions, even if you've added your computer as a trusted device.

4. Test disabling other extensions - some extensions like NoScript have been known to kill LastPass sessions.

4. If you're still being logged out of LastPass but don't have multifactor authentication, and have cookies enabled, and have tested without other extensions, please open a ticket and tell us if you're running any other browser addons or toolbars, as well as antivirus or other security programs.