Well, this morning I hit the unlock switch and the door lock in question worked perfectly..... several times..... never missed a beat!

The only difference that was apparent was a significant drop in temperature over night, so a lock mechanism with inadequate or marginal lubrication might have failed to open when hot, or so I'm hoping. Always locked OK.

Lubed the lock (with oil hat I paid for ) and so far all is well.

Or it very well could be an intermittent electrical/actuator problem that will continue to raise it's ugly little head and annoy the crap outta me 'till I finally break down and fix it

In any event, if this is the biggest challenge 'till I get back home to Florida, I'll feel very fortunate indeed!