problem: Overnight (when DHCP refreshed) the PI4 disappears from the network. There is not reply to /octopi in browser, it's IP addressin browser, SSH or IP scanner.
What did you already try to solve it? Tested with the methods above. I have observed this behavior from time to time with other Pi running other versions of raspian but never with Octopi. Fix is usually running:
sudo ifconfig wlan0 down
sudo ifconfig wlan0 up
sudo service networking restart
Logs: unsure how to get syslog without GUI
Additional information: Raspberry PI 4 running lasted release candidate of Octopi. Installed from image.