Jonathan,
It looks like you arrive at 08:00am and do your login which authenticate you on the network and generates an "login event". after 08:00 straight, your session expires. It looks like after you arrive, no further login is made or no communication is going through to validate that you're still logged.
Do you use FSSO ? what's your "dead entry timeout" ?
Do you have windows firewall enabled ?
Do you have remote registry enabled ?
Your FSSO tries to "pool" you at "verify" times. After sometime, it gives up removing you from the "logged users" list, and consequently you have to login again.
Check the logs from your FSSO to check for more information of what's going on. search for your IP address.
Best regards.