My ST has developed a substantial rattle at speeds under 25 mph on bumpy surfaces. I sounds kind of like the hatch isn’t latched, the parcial shelf is loose or the seat back is not latched. Everything seems ok when I tug on it so I am a bit perplexed. I plan on running with the shelf out then the load floor out then the seats folded down, etc. in an attempt to locate the cause. So far I’ve proven it’s not the seat belts by latching them and that it’s not the spare tire or the jack that’s the issue. Has anyone else seen this issue before? FYI my orginal parcial shelf cracked somehow and was replaced but I didn’t carefully check to see if they were identical before I tossed out the old one.