1) Loose shoulder flaps? ---> OK on mine. (one of them did dropped during the first transformation, but never happen again when I slide them out with caution afterward.
2) Reinforced neck hinge? ----> can't tell, but I can see stressmark, don't know if the "hole" size are correct, but I can feel no friction once you unlock it from the chest plate.
Here is a pic, don't panic, it is not broken yet...