I think I know what happened, I am facing the same issue but when my left earbud is in the case the light is white, but when I put the right earbud the light becomes red. I been having some trouble with pairing and audio with my right earbud so it probably just stop working, and if I am not wrong, both earbuds have to be in the case to connect, but the right earbud is not being detected so it does not let pair the device.