wondered if anybody had any comments on this..

Hopefully I have succesfully included a link to my watch. I have owned this watch for many years, worn it every day and recently read a story where another Monaco owner mentioned the date on his Monaco stuck every month on the 20th. About 5 years ago my Monaco stuck on the 19th - actually on my birthday. I thought this might be some sort of luck (good or bad) so left it as is - all other functions worked perfectly and it still keeps perfect time. A few days ago it ticked over to the 20th where it is now again stuck.. Is there some sort of spooky coincidence? Is there something in the mechanics of the date wheel? Or is this simply a 'siqn' that I should invest in a service.

Thanks and regards, Matt