I have encountered some issues with the smart doorbell over the past few months as below:

While checking on the doorbells, I find that frequently the devices are set to privacy mode by themselves, which is a concern to me as I would like to keep track of when people walk outside my unit. 

Also, I encountered the issue where the detection zones changed from gaps in between to overlapping. The former arrangement is more sensitive than the latter.

In addition, there are also times that the sensitivity is reduced from 10 to 6 by itself. I then have to manually restore the sensitivity back to 10.