Cracks caused by flying style?

Mine lives in a hard backpack. It has maybe 3 hrs flight time and already has an arm crack.

Not first time someone saying there is cracks and using backpack but maybe just coincidence. Just in case you might want check if there is any mark left by craft inside backpack.
 
Who do you have to know to get a "good shell"??
Yip secound that ,luck of the draw me p3s brought couple years back still goes hard with no cracks,p34k now unsafe to fly till i fix,had 10 flights ,,p4 got one crack only because i holding it hard to get battery out once before(jammed in there)1cm crack in middle side body,
 

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