After a freezing rain, the trunk lock was frozen so I used the electronic central unlock from the driver's door.
The trunk opened but the latch would not catch when closed.

I thought it was ice in the lock but there have been enough intervals of warm thawing to have gotten rid of it and the condition comes and goes seemingly with freezing conditions without snow or rain.

latching conditions:
- trunk is latched (no snow or ice but freezing conditions), I open it, it will not latch when closed
- trunk is unlatched and I use the truck key to lock it and it latches (but no always)
- trunk is unlatched and I use the front door electronic central lock to lock it and it latches (but no always)
- trunk is latched and as I drive down the road I hear tapping that is the trunk lid moving due to the latch having released.
- trunk is unlatched and there is nothing I can do to latch it.

These condition are intermittent not progressive or if they are progressive I have not put it together yet.
The trunk is currently latched.

Clues?
Thank you
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1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)