To resolve your Chromecast configuration issues, you can try the following:
Perform a factory data reset by holding the reset button on your dongle for 25 seconds.
Reset your modem or router.
Use the HDMI extension cable that came with your Chromecast.
Move your router closer to your Chromecast.
Make sure you're running your Chromecast on a 2.4 GHz network frequency.
Update your router's firmware if necessary.
Adjust your router's channels.
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