Hi,
I know this is an old thread, but i thought I would add this in case anybody is still having this issue. When I bought my new router, the printer wifi would connect, but then it would drop off after a day or so, and then i would need to reboot the router, or printer to get it to reconnect. I searched all these forums and tried all the suggestions and got nowhere. In the end I did a factory reset on the printer and set it up as if it was new, printer has been connected to wifi for a week now with no issues. Hope this helps somebody.