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To add to this thread my wife and I are using fitness + almost daily, both have AW4’s and using Apple TV, wife is connected to Apple TV, me iPad Pro. Often the Apple TV and watch will lose connection on starting a 2nd workout. Says please enable Bluetooth on watch to show metrics, however starting again on phone is phone. My connection to iPad has never been a problem. Does seem that there are more issues when using Apple TV over Apple TV 4K.
 
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