Hi guys,
it looks like my issue is solved now after entering a specific BSSID in my network connection.
Or to be more precise, the issue is solved for me now, but for sure the issue still exists when you have a meshed network.
The connection is rock solid now once it is pinned to an specific access point in my mesh network.
Without the entry for a specific BSSID it disconnects after some time. To analyze this a bit further it would be necessary to have a LAN connection or at least a screen and a keyboard. But unfortunately i have neither and the location of the device is a bit odd (it hangs in several meters height 😉 ).
If somebody is interested in solving this issue i can provide log files on request. I have mounted a remote switchable power supply, so it would be no problem for me to reproduce the issue again without the need to climb up again and again to reset the device.....