After about 12-18 months after I bought it, sometimes this watch lagged a few minutes behind.  Occasionally it stopped completely, but usually it just got a little behind.  (What good is a watch when it doesn't tell accurate time?)  I thought maybe it was because some moisture had gotten in (although it claims to be water resistant--I've had droplets get under mine like another reviewer said).  I liked the look of the watch enough that I bought another one just like it, and I take it off when I bathe my kids and do not store it in the bathroom.  But it does the same thing--occasionally lags behind, and once it stopped for a while.  When it stopped, I took it to a watch repair shop for a new battery and they couldn't get the back plate off.  But it started working again by itself, so I believe the problem is that it's just a defective watch.  I had trusted the Timex brand but now I'm unsure if I want to buy another Timex.