Your comment helped me to search in some direction as in the log there is:
z2m: Error: Failed to connect to the adapter (Error: SRSP - SYS - ping after 6000ms)
zigbee2mqtt | at ZStackAdapter.start
Common reasons for this error:
https://www.zigbee2mqtt.io/guide/installation/20_zigbee2mqtt-fails-to-start_crashes-runtime.html
Error message:
Error: SRSP - SYS - ping after 6000ms for zStack or HOST_FATAL_ERROR for EmberZNet
Common reasons for this error:
1.The port of your serial adapter changed. Check this to find out the port of your adapter.
2.If you are using a CC2530 or CC2531; it is a common issue for this adapter to crash (due to its outdated hardware). Reflashing the firmware should fix the problem. If it happens often consider flashing the source routing firmware or upgrade to a more powerful adapter.
3.Your adapter requires additional configuration parameters. Check supported Adapters section to find out if your adapter requires extra parameters (eg. ConBee II / RaspBee II).
4.Home Assistant’s “Zigbee Home Automation” (ZHA) integration is enabled. Try to disable the ZHA integration and restart the Zigbee2MQTT add-on.
5.Your hardware adapter is flashed with the router firmware and not with the coordinator firmware.
6.Your network Zigbee adapter is not accessible over the LAN network.
7.Another software on your machine (including Home Assistant integration) is interfering with USB devices (example: HA EDL21 integration trying to find a USB device).
Also, I found this link on openhab with the sme device as mine, Sonoff_Zigbee_3.0_USB_Dongle_Plus_V2, needed to be flashed:
https://community.openhab.org/t/sonoff-zigbee-3-0-usb-dongle-plus-v2-which-firmware-to-use/153779
That seems to point to 2.If you are using a CC2530 or CC2531; it is a common issue for this adapter to crash (due to its outdated hardware). Reflashing the firmware
I will put some time on it tomorrow.
Thanks