Two Turnigy 5200mAh 2S 30C Hard-Case Car Lipo Pack - both are dead after ~70 cycles. And I am suspecting it is their fault that my MMP went in fire

...
I know ~20pcs of dead or puffed exactly these LiPos.
PS: My chargers are Hyperion EOS615i Duo 3 and iCharger 208B. And I have ~20 other LiPo packs that still lives ok (for cars and planes). Info in case there will be comments about bad chargers or smth similar.