Domoticz

Hello everybody.
I would like to make a new project to know where is my son when he is alone at home. For that, I have a few fibaro motion sensor and a door open sensor. My controler is RPI + Razberry and I'm working with Domoticz.
I have a fibaro motion senson in each room. When I include the sensor near of controler, it's ok, but when I take to the rooms, some of their don't comunicate with the controller. I don't know why? I attached network image.
The distance between the controller and the sensors is less than 10 meters.
In the other hand. What happend when the raspberry pi is power off a few seconds? The network structure is broken?
Thanks a lot.

I would advice to have some net powered devices in your network. When pi is formed of and on everything restarts. Mind SD card corruption when removing power from a normally running system

Thanks you.
What powered device is the best for my network? Could I use the fibaro dimmer? Do you know some devices for this?