Just bought one of these for my wife.
The GPS signal is inaccurate. Google maps and Komoot both show the phone 'bouncing' around by about 20 meters from it's actual location in a random manner.
Is there any way to stabilize the signal?

Did you have any signal obstruction? 

Nope, signal seems fine. Trying to get a decent GPS lock in an open field. My BV9500 is fine but wifes BV5500 is showing her as all over the place when she's right next to me.