Rolex GMT Master 2c running so slow it is going backwards.

[RolEXpectations]

Ok I bought the watch last week from my AD. They set it up etc.
Yesterday I noticed it was off by about 6 hours...but still ticking so I thought hmmm...must have stopped overnight (since I took it off while sleeping) and when I picked it up in the morning it started ticking again.

So I reset the time but the same thing happened again.
I figured it needed to be wound up so I did the following:

1. I set the watch to 8:00 am...wound it 40 rotations as stated in various forums.
Went for breakfast, and when I checked the watch at what at 9:30 am and it read 6:30 am

2. I set it at 10:25 am and took a picture with my gf's watch to show they are in synch so no mistakes. At noon my watch read 11:25 am

I took it to the AD and the technician is perplexed...at first said that it could be electro magnetism...but not after he heard the specifics.

I have left it with them for the weekend for tests.