Roku Player refusing to connect to WiFi Connection

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A smartphone or tablet will also allow you to see neighboring connections, but I don’t think that’s the issue. The old house may have had a different provider/speed? Is the TV set connected to Roku by HDMI? If they have a lot of devices connected to their Wi-Fi system, it will slow the system down. Sounds like they have a reasonably good router, so you good try setting up priority to the Roku. That may help. I suspect the router is near the modem, which could be interfering. Try relocating or separating the devices. Try elevating the router or reorienting the router antennas, or an extender for a large home. You can download a speed check app to check speed of the Wi-Fi connection. If all else fails, try restarting both the router and modem, or pull the power plug on both devices for one minute.