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Have you tried turning off WiFi direct on the printer?
1. On the printer control panel display, from the Home screen, touch (Wi-Fi Direct).
2. Touch ( Settings ).
3. If the display shows that Wi-Fi Direct is On , touch the toggle button next to Wi-Fi Direct to turn it off.
When WiFi direct is on the printer creates its on network on the same frequency as the modem for devices to connect to. This might cause interference with modems network.