Check your network settings. Are you using fixed IP for your AVR and DHCP on the router, or vice versa?
Can you connect to the AVR via a laptop, using the IP displayed on your AVR "On Screen" -> Setup -> Network -> IP Adress page
What I generally do is have a pool of fixed IPs set up on the router (1-100), and DHCP pool from 101 up. Have all you fixed devices (AVR, Streamers, NAS) set for fixed IP and all mobile stuff (phones, tablets, laptops) set to DHCP
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