After the recent issues with mDNS with certain security settings on my HPE switch causing Matter and Thread issues in turn.
I have also added a step in my HA automation’s to power cycle the TBR 6am and 6pm as well as 10s after my HA instance restarts via the dedicated zigbee plug to help mitigate the test sensor I am using from after a few hours goning into unavailable state.
I will update the thread with any other quirks I find and mitigate, will see if they release more firmware updates as well over the time I have this setup.
edit: power cycle steps no longer needed, thread setup has been stable.