Are you by any chance running pulse with wireless supression enabled? We have been running into the issue quite a bit where users are randomly disconnected from their pulse connection. The best part is that most of the time the person can not reconnect, they will have to simply restart. I have ran a PCAP on the user trying to reconnect after a disconnect and you don;t even see the connection attempts. It is almost like the action behind the connect button never triggered.
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