I have a host which is connected to internet via rather unreliable mobile hotspot. Connection is lost frequently for a few seconds or minutes and then recovered automatically. However, sometimes host becomes unreachable after connection issues. When I checked the log file I noticed that there is an error message "Internet-ID stopped - Stop command. Reason: Duplicated ID".
I have tried to generate a new Internet-ID but the problem still persist. I suspect that connection is lost for so brief moment that host loses connection but Internet-ID server doesn't notice that. When host connects to server to register itself a conflict occurs. Host recovers from this situation only be restarting the service.