aemeijers wrote:
Time again for the twice a year 'atomic clock' thread. Mine reset itself
just like it should last night, but sometime today set itself back to
daylight time. I tried a force reset, but ten minutes later the hands
had gone from wrong time back to correct daylight time.

This seems to happen with every single time change or dead battery.

Did anyone ever come up with a diagnosis, last time around?

Hmmm
Maybe the reception of WWV signal is poor. Try the clock at different
spot in the house.