Seiko 7002 diver problem

[muggo]

Hi

I bought a 7002 on eBay a couple of months ago from a business seller in the UK who stated it had been "fully overhauled" & was "in near perfect condition".
It kept terrible time so I returned it for adjustment, but when I got it back it was no better, so I found out on this site how to calibrate it & did it myself. It now keeps pretty good time.
My problem now is that once a week or so, it just stops. This happens when it is on my wrist & I assume it's fully wound as I've been wearing it daily for weeks now. If I shake my wrist it starts again but will probably stop again in a few days.
I don't have a good relationship with the guy I bought it from so can't see him being very effective in sorting it, so can anyone advise what the problem might be? I appreciate it may be a difficult question to answer, but do you have any experience of a similar fault with this type of watch?

Thanks very much
Paul
PS Previously posted in the wrong forum. Sorry about that.

[muggo]

BUMP
No replies at all.
Can anyone help me with this please?

[dom_]

BUMP
No replies at all.
Can anyone help me with this please?

Not really a problem you can fault find over the internet. I see it that you have two options, return the faulty watch to be corrected or if you don't want to do this pay for someone to check it out and service it.