I just bought a new DR900XPlus-2CH and What ever I do! Time is a bit off, always by 2-5 minutes!

I am In Europe. Is this normal behaviour? does it happen on purpose and/or needs time to sync in proper time?

1. I set time manually, it formatted the sd card! time is +5 m
2. Set GPS (GPS works) properly.:
 - Began with 5 m difference
 - Then went to 2 m difference!