J serial Diver runs fast on wrist, is it normal?

[fonglik]

Hi all,

I'm new to AP and just got my 15710 Diver recently.

I've tested it for few days and found that if I let it rest on the table with the crown down position, its accuracy is almost spot on; once I put it on my wrist, it ran fast and gained about 1 second every two hours.

My question is, is it normal for the calibre 3120? Does it sound like a re-banking issue?

Many thanks
Li