Yea, your guess is as good as mine. I get it from time to time, too.

I've not found a low fluid level, now, once I had the oil level alarm going "HI", but it hasn't done that since I started using 8 (not 8 1/2) quarts at oil changes.

I get the beep at times, too. And I've had two Roadsters, the red one did it once or twice, the Graphite is doing it at least once a MONTH.