I tried LiveXLive as well but I’m still having the same problem. Only difference is music will play on the source tv for a few minutes and then stop again but still continue on the other airplay speakers. Have you had this issue too?
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I have the same problem. I don’t think the problem is with Pandora though. Sirius XM App does the same thing. When I play music through Apple Music, however, it works fine on multiple speakers (including the source ATV). I think it’s a problem on Apple’s end. TvOS 14.4 did nothing to fix it unfortunately.
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