Network - Wireless & Wired Connections

Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
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Level 7

Roku Premiere stopped seeing wireless networks after 5 months

I have 2 Roku Premieres in the house. Both worked fine and picked up our wifi signal plus the signals of our 3 closest neighbors. Now, one of them no longer sees any wifi networks. It's only 5 months old. I have rebooted the router, rebooted the Roku unit, reset the network connection within the Roku. Nothing has worked. It's pretty clear to me that the WiFi antenna no longer works.  My parents used this particular unit. They really like the Roku service, so they rushed out and bought a Roku streaming stick to replace it. I would like a refund for this faulty unit. I still have the receipt. Please advise.