It's been years since I fought with this problem on my 1988 244, memory may not be precise therefore.
Open the box and look at both the door hinges. The point where the hinge attaches to the box gets weak,cracked,saggy. That lets the door droop just enough to allow the latch to drop from its catch hole on a bump/pothole/rr crossing, etc.
The catch hole is in the roof of the glove box, easy to find with a fingertip.
I made a little metal piece that sits on the outside top of the box and reaches down below the edge of the catch hold just enough to let the latch piece on the lock to catch and stay. Took a few trial fittings and IIRC there was a problem gettng around the light lens thing. I used a brass 4-40 x 1/4" bolt and nut because I had some; glue may work fine, too.
Some folks have a way to use long screws like a sheet rock screw up from the bottom of the box at the corners to pull the hinges up just enough. The screws go into the steel frame that the box mount screws go into.
If available, and un-cracked box can be swapped in. The hinges have a steel pin in the center that can be drive out using a small philips screwdriver and light taps with a small hammer or whatever. Take the first one almost out to finger lose. Then remove the second pin while carefully holding the door up. Pull the first out and you're clear. This protocol will avoid having the door weight hanging on the second hinge. (Pin removal is also a way to open a locked glove box with no key.)
Remember that those seven screws holding the box unit in the dash are very easy to over-tighten and strip out the threads. You'll have a PITA then - searching for slightly over-size screws.
Good Luck,
Bob
:>)
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