Verify in the printer that 'Auto Off' is disabled. Set a static IP in the printer outside the DHCP range of the router. Use a fixed wireless channel like 1,6 or 11, never 'auto', try all three. Set router to 20Mhz only, or 145Mbps depending on router. Always use WPA2-AES encryption. Power off both. Power on router wait 3 mins. Power on printer and verify it reconnects to router. Now try
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