I coauld imagine that in between 11 pm and 2 am it losses a lot of time. Perhaps the problem is with the datechange. It takes too much power for the hands to turn the date.

I would test the watch 3 - 5 times setting the time to 11 pm, and wait 4 hours. Time the watchaccurecy.

If there is a problem then it is the dates fault. If there is no problems then I donīt know what it is. Either way you must take it to an Omegadealer.

Regards