Nav clock issue?

[BAC5.2]

This is kind of an interesting problem.

 

The other day I got to work at 10am (truck hit an overpass and shut down the highway) and shut off the car. Left at 5:30pm and started the car. The Nav-clock and the clock in the cluster both read 10:00.

 

I reset the clock from the Nav screen, and all was fine. Garmin's clock was correct, however.

 

I thought it was a one-time occurance, but on my day off I got back home at 9am, shut off the car, and when I drove it again at 3pm, the clock read 9:00.

 

I just left it this time. I shut the car off and the next time I drove it later that night, the clock readjusted itself. I started the car and the clock read 9:35 (when I shut it off) and then automatically updated to 17:45, the time it actually was.

 

Anyone else ever have this issue?