you MIGHT have a serious problem....BUT...because of their inherant liability issues, airbag systems usually are pretty reliable. So one way or another figure it out!
I SUSPECT you have a different, very simple problem. I have it as well from time to time. The next time it comes on, place your palms at the upper corners of the instrument panel and press forward & release several times -- does it go out?
If so (as mine does), then your problem is the very common "bad connection" at the two connectors between the dash and the instrument panel. There are many threads out there about this issue as well as ways to clean & tweek the pins, grease, and reassemble.