I’m experiencing the same issue with my dual-doorbell camera, which is currently on the Cam Plus service. It has stopped alerting me for people or vehicles. At first, it only missed alerts after a certain time, but now, if a person isn’t right at the door, it doesn’t notify me at all. For example, a delivery driver came to my door, but the camera didn’t notify me about the person - only about the package later. My sensitivity is set to 10, and I have zone detection enabled.
On the other hand, my Cam Pro in the driveway - without Cam Plus service ”is working perfectly.