Why wont my doorbell pick people walking up my steps but will pick up a dog across the street?

Have had our Doorbell 2 for almost a year with no issues until couple weeks ago and it stopped picking up people that are in close proximity to the camera. I have not changed any settings and it picks up cars driving by fine and people walking across the street like 60 plus feet away buf if someone walks on my porch and is 2 feet from the doorbell it does not pick it up. I added a wedge to angle it down and no change. Either all the "latest" software upgrades screwed it up or it is hardware failure of the doorbells sensor. Very frustrating in the days we are currently living in when this is very important to know if someone has been on your porch.