Did you check for the angle like 2slo4u you mentioned? also upon closing, when you push down on the hood, does it just pop up again or does it not close at all unless you let it drop? Have you checked if the length of the latch (like is one worn down and the other isn't or distance between the two parts) fits snug? one might be shorter, I know it sounds weird but it happened to me once so it could be but maybe not enough, take a good look at all possibilities. we can only help you as much as the info you give us