This is a very well known issue, that unfortunately started earlier this year, after a screwed up update. Many people "lost" their fitbit due to no being able yo either sync, charge, hold charge, messed up heart rates, unable to even connecting to the phones and the list goes on.
Fitbit is well aware of this but clearly in denial. They run some more updates to fix the "broken" one, but again it gets worse. At the end of the day they label it as "solved" when its not. If you contact customer service it will be your fault, recommending a newer version of your watch ( of course with a discount ) or buy a new phone and theres always the replacement if you are still under warranty. But again that "replacement" option is even more frustrating and in most cases worse. You can read lots of topics on this forum about it, including my own experience.
Things that "worked" for me and by all means its not perfect but at least this saves my battery a bit was rolling back to a much older software version and disabling auto update and ignoring the update message everytime you start the app 😒
You wont be able to sync your data half of the time, or getting the message that no phone is paired, but hey its either that or a watch thats completely useless.
Maybe one day fitbit gets it together but i lost all hope, especially now with google being in charge. Good luck and i truly hope that you can find a way/option to get this working in a way that might be acceptable or tolerable for you.
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