I have been enjoying an IWC Mark XVI for one and a half year.
It consistently runs slow 1 second a day.
I avoid wearing it during sports, although I wore it while skiing without problems.
Today I participated in soccer while attending a family party.
Later I discovered my watch is running fast 15 minutes an hour !
I must admit I also acted as a goalie, including stopping hard kicks with my hands. Maybe these impacts caused the dysfunction?
What do you guys think happened ? And I suppose I need to go back to the AD to have it fixed?