00035 Clock mystery- WWVB Radio Controlled Clocks

Clock mysteriously gets signal to reset itself.
Help with WWVB Radio Controlled Clocks
SP960_14To find out more about WWVB radio controlled clocks, please download this 64-page PDF booklet:
WWVB Radio Controlled Clocks: Recommended Practices for Manufacturers and Consumers (NIST Special Publication 960-14, August 2009)
You may also receive a printed copy by sending your mailing address or by calling [phone].
How They Work Where They Work What to Do When
They Don't Work Manufacturers of
Radio Controlled Clocks
By now, you have probably seen or own a radio controlled clock. These clocks are sold in all forms: as wall clocks, desk clocks, travel alarms, and wristwatches. They have a tremendous advantage over conventional clocks, they are always right! When working properly, radio controlled clocks always display the correct time, down to the exact second. This means that you should never have to adjust them. During the transition from standard time to daylight saving time (DST) they "spring forward" one hour, and when DST is finished they "fall back" one hour.

[@johnwest7993]

They must be having fun. :)
BTW, I remember during one of the first government shutdowns someone at WWV let the WWVB time signal just start sending out random data, screwing up the few 'atomic' clocks available at the time, but more importantly messing with frequency calibration labs all over the US, Canada, and Mexico. I know this because I had built a receiver for the signal to use to calibrate the equipment in my ham radio shack, and since I only lived 50 miles from the transmitter I could hear the harmonic of the transmission on 180 kHz on my LowFer receiver. It was spooky hearing a cornerstone of American technology become erratic.

[@austincooley6643]

Is the second hand on this one loose?🤔

[@johnwest7993]

I think the ' 1second' pulses have been stopped. The microcontroller probably has a different algorithm to handle time corrections on the clock for the minute and hour. They probably wait to do anything with the second hand until the hour and minutes are correct. Otherwise the second hand would be screaming around at the speed of a high-speed motor and the hour arm would still take a long time to get caught up.