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Quote Originally Posted by SzTommi View Post
... it stops the music in the background ... Is there an option, or something that makes the background music, or the phone call just quieter during the notification?
Yes, it has been written about many times. Browse and read

Quote Originally Posted by SzTommi View Post
... lost GPS signal twice... But what else can cause that?
This has been written about as well. The sole culprit is the device system.