Vintage BR123 running slow
I received my Vintage BR123 in February. After less than a month I noticed that it was running slow by 5 mins. It underwent B&R servicing in March until last week. There was not much explanation as to what was fixed. After a week it's already behind by about 3 mins.
Please note that it was wound by the B&R dealer so I assume that it was fully wound. I wear the watch all day. During the night it's positioned crown up and at distance from magnetic fields (mobile phone).
I would appreciate any advice on this.