Pioneer AVIC-D3 Car DVD Player "set clock back 1 hour" Questions

...clock and it seemed fine.....now the time stays ok....but it keeps jumping to A.M. I set it back to P.M......then in a couple of minutes...it jumps back to A.M. Any ideas? ...

...clock. The time difference (+, -) between the time originally set in your navigation system is set here. You can also select summer time On/Off. > Time settings, (See page 131) Summer Time Choose ...