I have a similar problem with my Pan V3 not following the track when the person goes directly below the camera. The camera has to rotate as well as pan and when it’s rotating in most cases will stop tracking. I have my sensitivity turned up and rotation speed turned up but not at MAX. In some cases the camera will rotate the wrong way and hit the rotation break so it will not rotate back the other direction to continue to track. I do not have a zone selected and have played with the field of view for better start position which has helped a bit but not solved the problem. I have sent several examples to the Wyze AI improvement link.