Onkyo TX-RZ3100 User Manual page 152

Troubleshooting
Playback is interrupted and communication does not work
You may not receive radio waves due to bad radio wave conditions. Shorten
the distance from the wireless LAN access point or remove obstacles to
improve visibility, and try again. Place the unit away from microwave ovens or
other access points. It is recommended to place the wireless LAN router
(access point) and the unit in the same room.
If there is a metallic object near the unit, wireless LAN connection may not be
possible as the metal can effect on the radio wave.
When other wireless LAN devices are used near the unit, several issues such
as interrupted playback and communication may occur. You can avoid these
issues by changing the channel of your wireless LAN router. For instructions on
changing channels, see the instruction manual provided with your wireless LAN
router.
There may not be enough bandwidth available in wireless LAN. Connect using
an Ethernet cable.