“Every 5-10 seconds the entire TV screen flashes black when trying to stream... even if I'm just watching cable on another input and not using Chromecast- the screen flashes several times a minute.”
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We recommend checking your Wi-Fi network for possible bandwidth congestion. Removing some of your connected devices and recreating the issue will help confirm congestion. If the issue persists, please reach out to our support team via the Chromecast support page here: https://support.google.com/chromecast/gethelp
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