gps signal lost when running in background

Hi,

I am using primo 9.6.29.596752 on an android head unit, and whenever I switch to another app I hear "gps signal lost (in german ;) )" and navigation is interrupted. When I change back it resumes after a couple of seconds.

The only thing I could find in sys.txt that seems to relate is background_navigation=1

Any ideas on how to fix that would be greatly appreciated.

Christian.