Followed the instructions in the link offered by DC Ron and sure enough the hard drive was loose inside the case. (The Band was loose in the Box) There is approximately 3/32" slack side to side and maybe 1/8" slack behind the drive opposite the connections. So, it can easily wiggle back and forth and then slide back enough to disconnect. I cut some small pieces of hard foam padding to size and packed them in to take up some slack and help prevent dislodging again.
Looks like a decent quality Toshiba hard drive. Maybe PG could offer a better fitting case for it. I kind of don't like the 1 inch USB dongle cord that has to hang out to connect a USB cable to it either. Seems vulnerable to wear and tear. I would rather have a simple USB slot with a fold-over flap to keep it clean.
The instructions in the link look like an older or different case/cover without a screw. My 2016 version has a micro screw that was not too difficult to access. I disconnected and reconnected the hard drive and my computer was then able to find it instantly. I've never been rough with it and don't think I've ever dropped it but now I feel a little insecure transporting it anywhere and then depending on it without having to fix it at the spur of a moment.
Might call PG on Monday to see what they suggest.
Thanks for your replies.

Does the noise in your head bother me ?