Yes this problem is very consistant in the Lime Green Hand Joints and Leg Joints.
Lego accidentily cooled the batch of these pieces for too short a time causeing the pieces to be brittle and to break easy.
This has been happening in set # 8914 Hahli Mahri, 8920 Ehlek, and 8939 Toa Lesovikk.
The best option is to call Lego they will be gratefull to replace your parts within 9-12 buisness days.