shotgunfatcat

I did some google searching and a bit of searching on here, so forgive me if I missed it, or it is a common thing, my last Chevy was an 07. After I get out of my truck and a few minutes go by the hazards flash a few times. The only thing I can think of is if it is some kind of warning for not locking the truck? The times I have noticed it happen I don't think I locked it. Or is it something else I should know about?