I have a doorbell that was hard wired to the house. Every now and again I have to reset the doorbell, usually when someone has rang the doorbell. Ringing the doorbell causes the doorbell to shortout and disconnect from the wifi.
Once the doorbell shorts out the only way to get it active again is by holding the reset on the side of the unit for 30 seconds. I checked the voltage of the unit and the voltage coming from the wires is about 22.2v, which seems ample for the hardwired use.
I’ve also noticed that for whatever reason pushing the button for the doorbell it does not always activate the analog doorbell chime inside the house.