I think I'm having the worst luck with my newer Predators.
My "Shadow" Predator left arm was stiff and wouldn't bend.I tried forcing it and the arm pulled out where it pivots.Super Glue fixed that.
My "Berzerker" and "Tracker" Predators legs wouldn't bend at all.I heated them up and now they bend.I think Hot Toys has some quality control issues !!!
Adding pics
You're not the only one with bad luck. I bought an extra falconer body for a custom and it broke at the knee. I barely put any pressure at all. I just tried to bend it and it snapped.