Hi
Possibly this is caused by a very old Unity bug that causes android applications to crash when using the Capsule mode for collision testing.
See Graph scan crashes the app on Android
Try switching the Grid Settings -> Collision Testing -> Mode from Capsule to something else (like Sphere).
If that does turn out to be the problem, it would be really nice if you could also send a bug report to Unity so that they could get around to fixing this bug at some point.