99 Reminder Bell dinging while driving?

When you put your car in park and open the door the reminder bell dings to tell you you forgot to turn your lights off or take your keys out of the ignition. Well my bell was dinging while I was driving. It stayed on for the whole half hour ride home from work today. My lights weren't on and I know the gear shift was fully in drive. What is wrong?

When I first got my car, the same thing happened. It went on for about 8 months. I actually figured out that my trunk was not closing all the way. I know it sounds idiotic, but try checking that.

Heidi