The post on the lower car body that the hatch "bear hug" latch clamps on to has a plastic sleeve around it that can crack and crumble off. Take a close look at it and compare it to a car with no problems, and you should see that there's a plastic sleeve supposed to be there (although yours might be gone due to breakage). Mine did and caused a very loose hatch condition, despite the fact that nothing else had changed. I initially tried to correct it by putting a 1" length of split plastic piping on the post to allow the lock to clamp on tightly, but it didn't work. I ended up just pulling a junkyard post off another car that had its plastic sleeve intact and swapping it in. The thing uses a Torx drive, and there's a captured nut behind the lower bodywork that holds it in place. Just cop another post and use your Torx bit to swap it out.