I usually work with the PC version and rarely with Android (which works quite well for a quick label without bells and whistles). I have the printer on the LAN and not on the WLAN. But, that's why I'm writing an answer, even in the LAN (with DHCP static lease) the printer is no longer accessible after some time (it feels like 1 day) - it has to be "rebooted". I can therefore very well imagine the problems with WLAN.