Hi I got a DCO12 18 volt , I have changed time zones, back and forth for 4 years, I have to use batteries, and replace batteries when dead, the time would change and worked great. One time I put radio channel on CBC, not sure if that was it but when I changed battery the display came up blank, no time and no display. now wrong time, can't change it, 2 hrs and 20 sec. off. has anyone found out how to change it?