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Charge 4 not registering sleep stages

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As mentioned above, have tried everything and sleep stages are not appearing on app, have Charge 4 2 days and both days nothing updated. Help!!

 

 

Moderator Edit: Clarified subject

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My old one was very poor when I first got it but (without me changing anything)became more reliable. FitBit replaced it under warranty for another reason and the new one has been excellent. It seems very hit and miss but with a mass produced product like this that is not new it should be near perfect.

Sent from my iPad
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