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My Xperia Z3 turns the map 90 or 180 degrees every 10-15 seceonds .
Really frustrating to look at. Didn't have the same problem in my HTC One M8 and Navigon.
Don't experience the same, if I use Google Maps for navigation
What if you clear the data
settings > apps > all > garmin navigation > clear data > restart the phone.
Well. It kind of solved the problem. Now I can't use it at all 
It wants to register Navigon again, and I get a server error
You should contact the app developer.
After restarting several times, I have succesfully registrated Garmin Navigon again.
But the problem remains the same. Still trouble with the screen.
Do you have a taskiller? antivirus? any battery apps? have you uncheck auto rotate?
No taskiller, no antivirus, and no battery apps. Have not unchecked auto rotate, have never been necessary on my ealier phones with Navigon
That's quite odd, but you have to contact the app developer if you keep experiencing the same issues. Do you have a magnetic case?