Most Canon or other printers will not operate on 5ghz, they need 2.4ghz, and when it has lost its connection and if the message for anyone is that the printer cannot connect to the network because of an unsupported frequency, then most likely the router has dropped the 2.4 or something is interfering with it. It has become more obvious to me a computer company owner and network installer for over 25 years now retired, that it would be a good thing for anyone with a home network to not only learn how to install wireless devices, but how to program and maintain their router as well. I also know that if you can wire your devices as opposed to wireless, you are better off! That being said, once you connect any device wired (ethernet) or wireless, especially a printer, to a DHCP network (the default for all home networks) DO NOT turn the device off. You don't turn your router off or your modem do you? Leave your printer on for the same reason. Turn it off and it many times it will lose its up to that moment network address and its connection to your device.
