Eureka!! I found it!!
After a hot, sleepless night, I began to check for a solution–within my limited ability. (I’m not going to climb up on the roof of the 5th-wheel trailer.) Changed the batteries on the remote AGAIN. Checked the breaker box and found the A/C needed to be clicked on AGAIN. Just so the reader gets the full “picture” (lol), I laid on the floor for the picture of air-conditioner grill, etc., mounted in the ceiling. For the record, the indoor and outdoor temperatures. ~~ Eventually, my air-conditioner will need a professional analysis. Hopefully that can wait until A/C professionals aren’t booked with service calls?!?! ~~ It is 81 degrees inside my trailer home as I type this (9:40 AM) but air is moving and I’m reasonably comfortable. (Kudos to SSSSS?!) When all else fails, I have a reliable three-speed fan.