I believe you are just outside your warranty. Its time to see a watch maker/technician about repairing the watch. Often times slowing is as easy to fix as lubricating the movement and forcing the gear train through the use of a cyclonic device. This fix takes minutes and is very cost effective. If the slowing is due t circuit board issues or a more sever gear train problem then the movement will need to be overhauled. I suggest comparing this cost to the cost of a replacement movement.
Standard-quality resonators of this type are warranted to have a long-term accuracy of about 6 parts per million at 31 degrees C (87.8 F): that is, a typical quartz wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 deg C / 41 F to 35 deg C / 95 F) or less than a half second clock drift per day when worn near the body.
If a quartz wristwatch is "rated" by measuring its timekeeping characteristics against an atomic clock's time broadcast, to determine how much time the watch gains or loses per day, and adjustments are made to the circuitry to "regulate" the timekeeping, then the corrected time will easily be accurate within 10 seconds per year. This is more than adequate to perform celestial navigation.
Assuming that you have a computer with internet-synced time and good internet, meaning around 1/100 second accuracy, why not compare the watch to the computer over the space of a week?
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