Delroyb
·Might it be magnetized? Worth a shot to use a cheap compass just to check out of curiosity. Otherwise, that response from the watchmaker worries me as well unless there's a pre-existing issue with the watch, in which case he still should have pointed that out instead of using that terrible response.
This was my fist thought as well. Some scanner in the postal service, or even just placed near something magnetised enroute? Very easy to check and get rectified. It can do all sorts of weird stuff, I've had watches in that were running minutes out, with mad beat error, which have been almost back to spec after a trip through the demagnetiser. (Obviously not a substitute for a full clean and service)

