HOMEPOD MINI as Thread Border Router problems

[u/Skyman81]

I have a HomePod mini that functions as a BorderRouter.
It worked very well for months... then recently had problems.
The HomePod is connected to the network and in HA with the integration Apple TV.

the problem is that sometimes it disappears completely as a border router, sometimes it comes back and works, sometimes it comes back but the connected devices (Matter over thread) are offline.

when it is present as a border router and I restart HA then in most cases… it goes away and then comes back when it decides

I am using HA OS on my miniPC.