Help with NZBget

I have had NZBget running in the background for years. Recently, it shut down overnight and I can’t get it started again. I’ve uninstalled and reinstalled the app several times. Sometimes, the app will start-up, only to shutdown a minute or so later. Other times, it won’t start up at all. Occasionally I can start the app and try to enter the user/pass, only to get an “unable to connect” message.

There were no significant changes which would have caused this. I had some downloads working one night, checked the next morning and everything was shut down.