Check fuse #9 (5 amp.) and replace if blown
It provides constant power to the on-board computer (OBC).
With only ignition-switched power the time and trip meter both get reset when ignition turned off.
Fues may have blown from a spike when new battery was connected up, or from a prior jump start.
This has been reported several times here, all 2006 models - but I can't see that is anything but coincidence.