Noticed this problem myself,but the unit stopped shedding hair very soon when everything settles down eg washed and styled.I believe its just a few loose hairs that are not knotted tightly enough when unit was made.Its nothing to worry about unless the shedding continues in large amounts all the time.I always have a few hairs come off the unit from time to time,and i believe that is just wear and tear.

Regards topcat.