Osram Smart Switch Mini caused Lidl light bulb to leave Zigbee network

Hi all,

I have a problem and need some kind of explanation.

Following scenario: After restarting my Home Assistant server, the Osram Smart Switch Mini did not work anymore. Each button press did not cause a single new line in the logs. I tried a lot, meaning ‘pressing all buttons at the same time’, resetting the device, trying to pair it freshly, but nothing worked.

Then suddenly, one of my Lidl lights just flashed and from this point on, I was able to control this light using the switch. But not as configured before and still without using Zigbee2mtt. All logs remained untouched. In the end I’ve seen that this Lidl light did leave the network as well. No other device was concerned, besides the switch and the light.

So my question would be, what did I do. Is it possible to remove a device from the network using another device? How have I been able to control the light without my Zigbee hub?

In the end, I forced the the switch out of the network, paired it again and now all Automations are again fine … the light still needs to be added again.

Thanks,
Fridolin