New submariner dying in less than 12 hours

[pegasis0066]

Hi, new to the forum. I did a quick search, but didn't come up with anything - sorry if this is a redundant thread.

My new submariner is stopping after only 8-12 hours overnight - when I take it off for the night. I thought I read somewhere that it should last 44 hours or so. Any idea what the problem could be - I will take it back to the dealer, but thought I would ask here to get a heads-up.

Thanks

Rob