[Oskar]

Privet, please try:
Correct the time under the system-menu at evening or night (it must be dark!!!)
Switch the unit off and again on.
Look at the time.
Has the time changed?
In my unit NO!
The time is and will be correct, also after few stops and starts with my car.
Also one day /night later!!!
But is must be dark!!!!

Can anybody explain this?

greetings from Germany
OSKAR