If the watch has stopped:
- Check to make sure that the stem is pushed in
- Make certain that all of the dial markers are on (they may be blocking the hands from moving)
- See if a piece of the crystal did not break off causing the hands to catch or the hands may be catching on the crystal itself
- Check to ensure that all of the hands are on tight (they will flop around if they are loose)
- It may be the battery or rusty
- Occasionally, an electronic part goes bad and needs replacing
If the watch is a manual wind or automatic and slowing down:
- The watch may not be given sufficient winding
- The watch may need cleaning
If the watch is quartz and slowing down:
- Check the same as if the watch had stopped (listed above)
- It may be the battery
- The watch may need cleaning