Go to Scheduled Tasks > Scheduled Task Manager and check to see if your Hourly Cleanup and Hourly Cleanup 2 tasks are running. You could run one of them manually and see if it fixes the problem, and if so it means they aren't running like they should.
Also check to see what you have set for Session Timeout under "Cookies and HTTP Header Options" in the options (The default is 900). If you have that set really high then it might cause the problem you described.
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