It's most likely because of Daylight Saving Time. Your clock receives a signal through the air once a day from the actual atomic clock, much like a cell phone receives the time from your cell phone service provider, and it automatically resets itself to the exact time each time it receives this signal. Remember that the middle of the year (the second Sunday in March until the first Sunday in November in the US) is Daylight Saving Time for much of the United States. The clock has an option that allows you to set whether you are observing Daylight Saving Time or not. If this is set to "off", the time will be one hour behind until Daylight Saving Time ends (November 7th). Make sure this is set properly, and your problem will be solved.
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