Just a weird idea from way back....
Older mechanical car clocks had a regulating mechanism in them. My 79 TA had it, man I miss that car, screaming chicken and all.
Whenever you changed the time this would tell the regulator that the clock was running too fast/slow which was why you had to change the time. MAYBE, our modern electronic clocks have a similar mechanism. The way you were supposed to adjust the regulation was to go past the desired time about an hour and then back up to it. This way the regulator was adjusted to slow down during step one and then speed back up in step two which cancelled out the speedup/slowdown.
Just a wild guess and it doesn't cost anything to try.
Good Luck,
Jim Henderson