The box is there but there is no data. Happened again last night. Still getting sleep scores and details about rem, deep sleep etc but no data for oxygen variations.
Same for me
Sleep score and stages are there but no oxygen variation reading
Try doing this:
Please try the following to turn on again your heart/ breathing rate:
After this, restart your Fitbit as it follows:
1) Plug the charging cable into the USB port on your computer or any UL-certified USB wall charger.
2) Clip the other end of the charging cable to the port on the back of the tracker. The pins on the charging cable must lock securely with the port.
3) Make sure the button on your tracker is aligned with the button opening on the charging cable. You’ll know the connection is secure when the tracker vibrates and you see a battery icon on your tracker’s display.
4) Press and hold the button to restart your tracker:
5) Unplug your tracker from the charging cable.