Weird Door Sensor Problem.

[JohnC]

Hey I have a weird problem going on with my 03 Sierra 1500HD. I got in it yesterday morning, and it said my left rear door was ajar. I looked, and it was shut fine. So I opened it, and closed it. Still said it was open. So I messed with the lock/unlock button and it locked then unlocked. I tried it again, and this time it worked, and the message went away. Drove it the rest of the day with no problems. Last night went to lock it with the remote for the night, and it did the same thing. I looked in the door latch this morning to see if something was stuck in it or something, and couldn't see anything out of the normal. Does anyone have any ideas what it could be, or how to fix it? When I get home tonight I'm going to try and disconnect the battery to see if it will reset whatever is messing up. Any ideas would be greatly appreciated.