Rolex 15200 loosing time after Rolex service

[damiansmart]

I recently had my year 2000 Rolex Date 15200 serviced for the second time by Rolex UK via my Rolex dealer.

After the watch came back from service it very soon started loosing 15 seconds per day. I returned it to the dealer who sent it back to Rolex under the service warranty.

After it came back for the second time it kept very accurate time for about two months, but in the last week or so its loosing time again, about 15 seconds per day.

I have had the watch from new since October 2000 and its always kept time within spec, but now since the recent service it seems the regulation is not quite right.

I guess I need to send it back to Rolex service for a third time.

Any thoughts on what could be the problem here?

Many Thanks.