My watch keeps slowing down - Cartier 21 Chronoscaph W10125U2 Wrist Watch

Try and get it ultra-sonically cleaned, It won't cost much at all.

mcdevito75 here, Yes it is normal, especially if your Rolex is an automatic watch. The motion of your Wrist / Hand keeps your watch wound thru the Counter balance on the movement, as the counter balance turns it winds the mainspring little by little, thus keeping your watch wound. Once you take off your watch, if long enough the mainspring simply un-winds and slows and will eventually stop your watch completely. You can keep your Rolex wound even when you take it off by means of a watch winder, a small machine that will keep your watch in motion, or by hand, by rocking the watch back and firth in your hand for about 30 seconds, say before you gpo to bed at night, this way there is always some wind to your watch.

mcdevito75 here, Look for a small watch repair shop in your area, and have the watch serviced.

The first thing I'd recommend for a 60 year old watch is to have a watchmaker clean and oil it. Over the years the oil gets thick and gummy and slows down the watch as you're experiencing. Once it's properly cleaned and oiled the watchmaker will test and adjust it to ensure that it keeps good time. This is not a DIY job but one for a trained watchmaker with the proper tools, lubricants and experience.

not often so . beleive you me from an avid fine watch collector . it's the batteries. hopt this helps.

This could be that the battery is slow. Newer swiss watches have a indicator in the movement of the watch that makes the sweep second hand skip every few seconds to indicate that the battery is slow. On regular japan made watches the watch just simply starts slowing down. Your watch could be new but the battery in it could have a long shelf life.

My watch has a similar issue recently. The light stopped working and I thought the watch was faulty but it was the battery was too low. Changed the battery and it started working again like a charm. Hope this helps!

There is nothing wrong with your watch. Probably it's the one measuring heart rate and pulse (heart beats per second).
Use your users manual to set the watch.
By the way: Timex is one of the worst watch producers.

Yor watch needs a cleaning. In the old days watches had a mainspring and when dirt got in the gears, the pressure from the mainspring would push the dirt out. Now with quartz watches there isn't any pressure to push the dirt out and the watch stops, or slows down. You will find that it cost more to repair than to get a new one. If you need anymore assistance PLEASE let me know and I will be glad to help.

crowbar040, you may have a problem with your mainspring click, which is supposed to keep the spring coiled as it winds. What might be happening is it is sticking and coming undone instead of winding. Or you could have a bad gear in your automatic.