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I had this same problem too, especially while using a connected 4K Apple TV. I’ve done all the troubleshooting (factory reset, testing with different HDMI cables and devices). Hisense tech support sent me a useless firmware update (version I0207) which is older than the current version (I12030) available from automatic updates. Since the product is out of warranty, I was advised my only recourse was to take the TV to local repair shop. Never buying Sharp/Hisense again!
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