Dose it continue to move ahead in time, or does it just go the 10 mins ahead and stay there?
Right click the clock, and select adjust time and date. On that window, the third tab over has "internet time". check to see if 1. your synchronizing, 2. who with, and 3. maybe try a different one
If you had an over power condition, or a higher frequency condition, your clock would continue getting ahead, it wouldn't get just 10 minutes ahead and maintain.