Hatch question

[bowtier]

So, the back hatch on the blazer is acting "strange" for lack of a better term. It won't unlock with the key fob, or the button on the hatch, or the button on the dash unless it has been locked & sitting for 15-30 seconds. Then it still won't open by using any of the above mentined methods. But it will open if I just push the "unlock" on the fob 2 times ~ or if I stick the key in the drivers side door & unlock it normally. Either way it pops right open.

So, strange huh?
I don't even have any idea where to begin. I just know it's driving me crazy! Help a brother out here.....