buy a new one i wouldnt doubt it if the hinges or whatever mechanism opens and closes it is worn out like when the hinge things on the back hatches of the suburbans wears it doesnt like to stay up it slowly falls down....idk truthfully but that wud be my best educated guess ya know haha good luck:hmm:
Hey Guy's I also have the same issue with my 05 GMC Sierra. After some searching I found the item on Wholesale GM Parts the item #/pn is 89045011 and make it's a fit match for your vehicle. Runs about twenty dollars kind of a rip but hope it keeps it closed.
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