Low Coolant Indicator Light comes on and goes off

What is your question?

When starting car this morning the coolant indicator on screen comes on. I turned off car and checked it of course it’s low but when I turn car on again it doesn’t show indicator (assuming it would have come on if it’s truly low). No leaks are noticeable under car and haven’t checked the hoses.

How long has your 2012 BMW 750Li xDrive had this problem?

Started today