Envisalink Homekit Remote Access

HA 102.1 on a Hass.io install, ATV 13.2 on an AppleTV 4, iOS 13.2.3 on iPhone 8.

Envisalink alarm control panel becomes unresponsive after leaving the home network. The integration has worked flawlessly for several months prior. ATV, HA, and iPhone software have all been updated in the last several days. Still can control alarm remotely with the native app and card still appears in iOS Companion App 2.0 (68).

Anyone seeing this behavior? I’ve restarted the ATV, but issue remains.