Raspberry pi 3 limit

To disable Wifi, add the following lines to /etc/modprobe.d/raspi-blacklist.conf and then restart Rpi

#blacklist wifi drivers
blacklist brcmfmac
blacklist brcmutil

Taken from here https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=138610

Not sure if it’ll help you now but I had similar issues with HA configuration I build on RPi3 which was on Wifi.
After some research the problem was with RPi3 not HA. In default configuration RPi3 uses power saving for Wifi and it was turning it off when for some reason it assumed that it wasn’t used.
I don’t remember exactly how I turned power management off (I don’t have access to this RPi anymore) but it should be easy to find.

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