Analysis: 1) The pwr under 'Sync'/'Config' status cannot be used; 2) The pwr under 'Invalid'/'Executed' status cannot be used; 3) the RTC drift too much.
Suggestion: 1) Check if the pwr succeed in Syncing; 2) Check if the pwr is in 'Valid' or 'In use'; 3) Confirm if the MCU would conduct RTC calibration automatically.