Restart Zigbee2MQTT when SLZB-06 has been unreachable?

Hello!

I use a SLZB-06 ethernet coordinator since 2 months now, it’s working fine, but everytime there’s something with the PoE switch it is plugged in (firmware updates of the switch with automatic reboot or power failure in that part of the building) Z2M stops working, though I have set the “watchdog” option it does not restart when the Zigbee coordinator has been unreachable for some time.
It seems that watchdog works only when Z2M has an internal problem.
How could I do to have Z2M restart after a reboot of the SLZB-06?

Thank you very much!