1. The watch is magnetized: the watch is magnetized due to too much contact with items with magnetic fields, which leads to the watch's inaccurate walking. After being magnetized, the watch may stop, either slowly or quickly. After the watch is magnetized, the magnetism will not fade by itself, and it needs degaussing repair to return to normal. So you have to go to a professional watch repair center to degauss, so that you can return to normal.
2. Insufficient maintenance: mechanical watches should be maintained once every 2-3 years and quartz watches once every 4-5 years. Watch maintenance should be thoroughly disassembled, cleaned, oiled, reassembled, adjusted and checked for the function of the movement; Repair or replace any worn or faulty movement parts. If the watch lacks maintenance, it will lead to the wear and sludge of parts, affect the normal operation of the watch, and make the watch appear fast and slow. Regular maintenance of the whole machine can effectively prevent the occurrence of various failures of watches.
3. Mechanical failure: mechanical failures such as watch hairspring failure, escapement system failure, and parts slipping may all cause the watch to appear fast and slow. Therefore, when the watch runs abnormally, you can first pull out the crown and take it to a professional maintenance agency for the maintenance technician to check the reason.