Hi guys, this is great topic, I have similar problem like swyner, i`m running Navigon on my china 2 din radio (audiosorces for BMW e46), and i`m having freeze screen problems when display switches on something else (etc phone/bt display when the call is comming), and when switching back to navi the screen is blask frozen, voice directions and everithing else regarding to navi seems to be working. Couple of times radio unit even restarted by it self, and when it boots up, navigon has to be restarted again....

Could it bee because poor hardware specs?