XC Track shuts down

Hi there,

I am using a Galaxy A21 s with the latest android version. After completing the XC Track Set Up with all the widgets I like (after 3-5 hours) the app shuts down after 3-5 minutes.

I connect it to XC Tracer. When reopening the App it says: "Activate permission for nearby devices". I already did so. Still the app shuts down. XC Soar works stable. Can you please help me with this problem?