The client exceptions shown in the log (error 10060 and 10054), just indicate a disconnection with the client.
It would happen if workstation goes offline, is suspended or there was some network issue.
Regarding the 'Update lease' errors, i guess are caused by the hibernation.
Once a license is assigned, the workstation must update it with the server periodically (every several minutes). If not, the server assumes the workstation is offline, and releases the license.
In this case, it seems the workstation tried to update their licenses, which were already released by the server.
I'm afraid our licensing system doesn't handle well this specific case, and it may be necessary to restart Max to assign a new license. We'll do some tests, and will try to improve it.