Rolex time accuracy on my blnr

[brandobot]

I have a blnr purchased in 2013 which has been running and keeping time great until this past month. I started noticing the power reserve was dramatically reduced to under 30 years. (The watch had sat face up on my dresser every night) I hadn't noticed until the next day when the watch was behind a few hours.

I ended up buying a watch winder and putting it in every night. Since then, the watch stays wound, but I've noticed the watch has been about a minute slow each day, requiring my ocd self to adjust the watch daily.

What would cause a watch this modern to suddenly start losing time? Has anyone experienced anything similar?