Watch minute hand getting slow

[tchcxp]

Hi guys,

One of my Rolex collections, a vintage Datejust, running around 3 minutes behind every day recently.

Basically, the second hand is running accurately, keeping -1~0 second difference every day; however, the minute hand is 2-3 minute slower when I wear it. Eg. I wind and set the watch at 7 AM, wear it, and then it shows 10:56:59 or 10:57:00 on the dial at 11 PM.

Other information I can provide:
- I haven't worn the watch for months
- The issue's been a few days already since I start to wear it again
- It's been fully wound

Not sure any particular reason why only the minute hand is slow but the second hand is ok?

Many thanks,