I have Alexa Turn say "Basement door open" and turn ON Basement Tapo Bulb when I trigger an open door with Tapo T110 door sensor on it.

When It closes, similarly, "Basement Door Closed" and light off.  Fine.

Today I opened the door, and nothing happened.  So, Looking into it, I notice the Tapo App showing ALL SENSORS are not connected.

my temporary Fix, is to power off the H100 hub, and power it back up.... FINE, all sensor devices re-connect, and I open door & it works fine.

Lost track how many times I have had to reset it this way!!  Which makes the system usless!

Why does it keep losing/dropping them.  

I've gone through all the standard debugging steps, it's not the router, its not inteference, its not my computer, its not my ISP, its not my neighbors dog using the microwave!, its just wants to drop all the devices. Totally Unacceptble.  I have temperature devices warn me if it gets to hot/cold.  Ive water leak detectors warm me if there is a leak!  What use are they if they don't work?