Gear Fit black and now syncing health data

Hi.
I have a "little" problem with my Gear Fit.
If i turn it on, and i pair with my phone, everything is working.
But after disconnect, and reconnecting, or after 1-2days, the wallpaper will black, and the health data (steps, pulse, etc.) not syncing, with my S5.
And if i restart the Gear Fit, it loses all data.
Pls help my guys.

Thanks, Oliver.

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