My 2013 loses a little time too. Our 2002 Saturn really lost time fast. Funny how GM seems to have a problem with digital clocks. The funniest glitch in my Volt though is the date. Onstar keeps it perpetually one day ahead of reality. If I manually reset it, it'll switch ahead at the next startup. Car's time zone is correct. Chevrolet customer service, onstar service, no help at all.