Grey Plastic Weirdness?

Has anyone else noticed some weirdness with Combiner Wars figures that use a lot of grey plastic?
For example: my copy of Offroad feels almost oily to the touch and his legs untab themselves at the slightest bump. Skydive and Motormaster have similar problems staying tabbed together. Am I just unlucky or is something up with the plastic they're using?
For example: my copy of Offroad feels almost oily to the touch and his legs untab themselves at the slightest bump. Skydive and Motormaster have similar problems staying tabbed together. Am I just unlucky or is something up with the plastic they're using?