Charge 2 sleep stages not showing on App

[Mooolio]

My fitbit charger is w working but nearly every night the app stops  synching esp for sleep. I have to uninstall and 'reinstall mist days. .

It's the sleep details I need.

I use a Samsung Galaxy J3

It was fine to start with for a couple if no the now isn't a driving me crazy.

Does the same with my iPad

Moderator edit: updated subject for clarity

[AlvaroFitbit]

@Mooolio Welcome to the Fitbit Community! I hope you're doing well!

I will assist you with your sleep stages. This feature doesn't depend on your device syncing at night. You may not get sleep stages for the following reasons:

• If you slept in a position that prevented your device from getting a consistent heart-rate reading or wore it too loosely. For best results, wear your device higher on your wrist (about 2-3 finger widths above your wrist bone). The band should feel secure but not too tight.
• If you used the Begin Sleep Now option in the Fitbit app (instead of simply wearing your device to bed). For more information on automatic sleep tracking, see How do I track my sleep?
• If you slept for less than 3 hours.
• If your device’s battery is critically low.

Let me know how it goes.