Vexing problem

[Atl]

All,
First thanks for taking the time to help us/me with our problems and questions. Here is mine:

Background: 2009 SS Sub Date, purchased from my AD in Sepetember 09. After a month, I noticed it ran 5-6 seconds slow per 24 hours. I had it sent to Rolex in Dallas after talking them to re-regulate, and they agreed, and did. After I got it back, if you stored it face up overnight it was losing one second per 24 hours. I was happy.
Last night, after not wearing it for a week, because my Pepsi GMT came back from Dallas after it's 5 year clean and polish, and I had been wearing it instead, I fully wound it (the Sub), and set the time to the US official time, and this is important, I set it crown down overnight, or, on it's side, crown down. This afternoon, after about 16 hours, it has lost 14 seconds! I will: re-set it to US official time and leave it face up tonight to see what it does, and I am calling Dallas RSC to discuss. But if any of you had any info I can give them when I call, PLEASE do so. I really don't understand this.

My question is, why would it lose almost a second an hour being placed "crown down" overnight??? My GMT really does not care very much which way you place it, it's usually is a constant -1 second slow per 24, no matter how you place it.

What could be wrong with my new Sub? It has not been dropped, abused, or old. It's only 5 months old.

Thanks in advance,
David