This is an old thread, but I’m still having the same issue with my Brother printer. I don’t have a permanent solution, but I have observed a few things that may help. Note that I did start off with your typical home wifi/router combo unit I’ve upgraded to professional level stand alone gear from Ubiquiti Networks to provide an advanced level of management and coverage across my house. 1) I don’t think this is an issue with the printer losing WiFi connectivity, but more of the printer not waking up. From Unifi Controller I can see that the printer has an active radio connection to my access point. 2) The printer always wakes up and prints when I print from my Mac (which uses CUPS), but has always been an issue from Windows. 3) When I can’t print or access the printer’s web interface, I can issue a “reconnect” command from my Unifi Controller. Windows will immediately communicate with the printer and print whatever is in my local queue after issuing the command. My educated assumption what is happening is...