The first log seems fine, this is the one wired.
The second log seems fine as well… I see that you have your DHCP lease time pretty short (12 hrs), but I also see that the renewing is working.
So this is difficult to debug. To make sure we get a proper log the following would help:
If the situation occurs again and the device is not available again, please connect a cable, go to the webpage and reboot the unit. As RoPieee runs entirely in RAM we need to make sure we get the log when the issue appears. So pulling the cable also wipes the log. Rebooting the unit from the webpage however stores the log.
Write down the time of the event, and send me feedback. I can then search inside the logs.
Oh. On a side-note: can I suggest you set the reboot time from ‘weekly’ to ‘daily’ on the wireless one?