Session state Disconnect 'Remote Sessions"

I have a test environment of View 5.2 under "Remote Sessions"  I see few disconnected session 40 days old.I think, If a user disconnects from his session (PCoIP/RDP). The remote session should be cleared.

Right now it gives false number stating that 30 people are connected in remote session but actually only 10 are connected.

Any idea, why we see this behavior and how to fix this issue?

I can try restarting the broker service but I would like to know what others have to say about it.

Thanks