Unstable acquisition

On the following map, I was traveling from SW to NE. I wanted to do a continuous recording of the road, until the orange road, on the top right. Indeed, you can see a lot of gaps associated with application crashes. Several times, I add to restart the phone. Are other users facing a similar issue?

Samsung J7@2016
Android 8
External GNSS Receiver Sparkfun RTK Express with Bluetooth_GNSS application and Mock location.