I've noticed lately that when I hit a bump my door open light
flashes. I checked all my doors to be sure that they were closed
good, but it still comes on. Is there a short somewhere or is it
just a glitch?

 

It isn't a glitch, it is a sticky latch. Get a good spray lubricant (wd40 is not a lubricant) and liberally spray the latch on the door - close and open the door several times. Problem solved.
If at any time you find that the car will not lock, despite all the doors being closed, that problem is similar - it is a sticky "gate" in the ignition switch which is supposed to close when you remove the key, thus permitting locking of the car. Same treatment to cure.

 

I sprayed a little w/d 40 in the key hole on the drivers door and worked the lock with the key a few times, seemed to cure my problem, thanks for the info!!