T60615 had the watch on, driving home, my wrist was bent and felt the date button click.  When I got home the date was wrong, so I tried to advance the date.  It advanced then stopped.  The button had a crunchy feeling when I pressed it.  I set the watch down for about 20 minutes and pressed the date button again.  The date advanced, then stopped again.  I even tried advancing the time to see if the date would change. Sometimes if I press the date button, the number on the right would go about 1/3 of the way but bounce back when I released the button
T60615