Durango dex410 v3 body week?

[childerbeast]

Hi just finished building my new 410 v3 and just picked up my body that my dad has kindly painted for me, to my horror the body has cracked both sides at the back i havent even cut it out yet, he also did my 2wd and 1/8th body same time both are ok, it seems the v3 body is very thin in places, has anybody had the same problem? Or am I unlucky