by connecting by ethernet it would confirm that connection dropping instead of relying on a connection to your TV.
have you tried changing the wifi channel from smart/auto to a specific channel for both 2.4 and 5ghz networks. I would use a wifi analyser on my phone to see what channels are in use near you and then select a free or less congested channel to see it that helps
do you know if any of your devices connect to your 5ghz network or all 2.4ghz
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