Conbee II not working after shutdown

Hello All,

I’m just started into HA and everything worked very well.
Just wanted to connect everything nice and backuped the system, give it a shutdown, connected everything the way I want (didn’t change the USB connection of the Conbee and P1 meter).

Power on… and got an error in Zigbee Home Automation. It is not starting. Did a reboot/power cycle/restored the back-up. Still the same result.

Conbee firmware is up-to-date. Did also uninstall Zigbee Home Automation and tried to reinstall in. Same result. Last thing was to update to HA 9.3 (before 9.2). Also no effect.

What did I do wrong?

Thank you in advance.

The first message of the event viewer:

Logger: homeassistant.components.zha.core.gateway
Source: components/zha/core/gateway.py:172
Integration: Zigbee Home Automation (documentation, issues)
First occurred: 20:16:44 (3 occurrences)
Last logged: 20:16:51

Couldn't start deCONZ = dresden elektronik deCONZ protocol: ConBee I/II, RaspBee I/II coordinator (attempt 1 of 3)
Couldn't start deCONZ = dresden elektronik deCONZ protocol: ConBee I/II, RaspBee I/II coordinator (attempt 2 of 3)
Couldn't start deCONZ = dresden elektronik deCONZ protocol: ConBee I/II, RaspBee I/II coordinator (attempt 3 of 3)
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/zha/core/gateway.py", line 172, in async_initialize
    self.application_controller = await app_controller_cls.new(
  File "/usr/local/lib/python3.10/site-packages/zigpy/application.py", line 144, in new
    await app.startup(auto_form=auto_form)
  File "/usr/local/lib/python3.10/site-packages/zigpy/application.py", line 125, in startup
    await self.initialize(auto_form=auto_form)
  File "/usr/local/lib/python3.10/site-packages/zigpy/application.py", line 110, in initialize
    await self.permit(0)
  File "/usr/local/lib/python3.10/site-packages/zigpy/application.py", line 929, in permit
    await zigpy.zdo.broadcast(
  File "/usr/local/lib/python3.10/site-packages/zigpy/device.py", line 518, in broadcast
    return await app.broadcast(
  File "/usr/local/lib/python3.10/site-packages/zigpy/application.py", line 744, in broadcast
    await self.send_packet(
  File "/usr/local/lib/python3.10/site-packages/zigpy_deconz/zigbee/application.py", line 419, in send_packet
    raise zigpy.exceptions.DeliveryError(
zigpy.exceptions.DeliveryError: Failed to deliver packet: <TXStatus.MAC_CHANNEL_ACCESS_FAILURE: 225>

After installing the back up on a Rasbery PI everything was working fine.
Few weeks later tried the same backup as before on the NUC. Everything works.

So for now problem is solved.