Ring Doorbell 2 Not detecting people

I have just linked up my doorbell2 . I set it up to only record on seeing people rather than just motion in general. This is because i live on a street that is busy with cars. While i secured it to the door the bell recognised me as a person and recorded it. But from that point, it no longer detects people.I can see live view no problems and also the door bell part works correctly when the button is pressed. I have the motion on the highest setting and the zone to the widest it can and also the frequency set to frequently.To test, i walk past the front door, wait a moment and walk back again, then back again and stand in front of the bell. Even as i enter the house walking past the bell, it still doesn't pick a "person" up.Am i missing something, or is there a reset button in case it has crashed?Any help would be appreciated.