Low battery?

Hi everybody,
my mum's having her vivofit 4 for about half a year and recently there appeared several promlems:
-data sync doesn't work correctly (the steps don't zero, activities done are not visible in the app)
-device is losing time
-the garmin logo (triangle) appears on the screen...
We are wondering the problem might be a low battery despite there's no alert in the app. Did anyone solved familiar problems? Thx for answering...
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