This could be caused by several things.
open it all the way and check the claws for damage or something stuck in them
there should be an allen head bolt inside at the base...check to see if this is loose....it is a left hand thread, if it is tight and the problem is damaged claws then take out this allen bolt, tighten a large allen key in jaws (or grab the outside with visegrips) and give it a sharp snap to the right to remove the end and replace it.
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