I am having the same issue. I am using Polisy, IoX version 5.91, PG3x Version 3.3.21, Schlage node server 3.2.4. I believe my issues started after I updated PG3x. All of my node servers showed as disconnected and I had to delete and re-install all of them. All other node servers appear to be connected, but the Schlage is showing disconnected.
I'd be happy to test something if that would be helpful.