Apps crashes on Fenix 6 but not on Fenix 5 and simulator

Hello All,

I need some advice.

I developed a simple Apps which works very well on Fenix 5 and simulator. The Apps shows altitude, g forces, and vario (vertical speed measured by altitude changes).

However, when Fenix 6 Sapphire users switch ON the recording session function, which also switches ON the GPS Positioning and saves all these data, the apps often crashes (but not always). 

I am not able to get the LOG file.  So, would you have any advice what could be wrong? null value somewhere? 

Jerome