Homekit integrations "no response"

Hi guys,
I’ve installed since months the HomeKit integrations and when it works is very nice.
The problem is that randomly simply don’t work as I see no responding device.
What I’ve done to make it working again is reload HA configuration but since some days it stopped at all.

What can I do? I’ve already tried to edit igmpv3 settings in my unifi controller without success.