Dahua motion events suddenly stopped, troubleshooting advice

I have a Dahua NVR and was using this HACs lib to integrate.

Cameras N85DL6Z cam NVR model is 54B3P2.

It was working fine for 6 months. But suddenly the events for intrusion alerts/motion stopped working. Trip wire as well. I do see the NVR making the intrusion alerts. But when I look in HA there is no indication of an event flowing. The Dahua HACS above has not changed version in months. I did upgrade the software firmware on my NVR, but also tried reverting it.
I tried in HA to listen to events like described in the Dahua HACs lib: listen for ‘dahua_event_received’ events.

Though the camers show up fine in HA, and i can see the videos and turn things on and off, these motion events dont seem to show up in HA. Any suggestions on how I further troubleshoot. I tried setting debug level logs for the custom component.dahua but it’s as if it never saw these events, though the NVR is clearly triggered and capturing events fine in it’s software.

Seems someone found the issue and pointed ot how to fix.