Unless you have GPS lock the clock will have issues, as the time is set from the GPS.
Is that the current location or just the last it remembers…?
Read thru this thread, it might be helpful…pay attention to the “Location Diagnostics” screen discussion.
No GPS signal after updating from 3.2.18124 to 3.4.21098 - Ford / Sync 3 - CyanLabs Official Community