Zeta, thank you very much for a thorough test!

On OnePlus X, same SFOS, the app is rock solid. I have not had any crashes after I changed OpenGL interface with QML to match the current implementation in QtLocation. Since I don't have any access to J1:

* would you mind to provide backtrace?

I can then search for this crash in Mapbox GL Native issues and maybe we would have to open an issue. We could also try to get the latest version of qt bindings (there seem to be one commit missing when compared to the current QtLocation version).

Let's see the backtrace and move from there.