Degenerate accuracy - problem with my sub!

[vrolok]

hi folks,

I have been continuously wearing my new 16610 for a couple of months already. The watch is a great all-arounder (dont certainly need to tell you this here ) and it did work flawlessy... so far. Now I've got an accuracy problem.

Well... it has been running within COSC, since its accuracy was +4''/day. However it drastically changed out of the blue. From one day to another, without experiencing any shock at all, its pace speeded up well over + half a minute per day!!!!!! Why?? Do you find it normal? Sooner as I can, I bring it to my watchmaker or to a Rolex AD (under guarantee of course), but in the meantime I'd like to hear your opinion You think it can be anything serious? Is there any reason for such a change? Any info appreciated