Clock going backwards

Hi,

anyone knows the phenomena of a quarts wall clock starting to go backwards?
In my extended family a clock (year old) started suddenly to go backwards. Since there were some anomalies in this apartment the owner started to think about some paranormal explanations.

I've never heard of a clock going backwards and could find anything about this on the internet (except clocks specifically designed this way, for amusement).

Yeah, my clock's gone backwards a number of times. Usually when the battery is weak and the hands have got to combat the force of gravity.

Some clocks are self adjusted, every once in a while they recive an update through a signal. My friend got one, it´s from the early 90´s i think.
The clock starts going backwards and then forwards to adjust.