I am going to assume that the pullaway is not
resin resession -

I have seen this problem (which is lack of adhesion of the
metal deposit to the hole wall) caused by the condition
of the hole wall.  If the hole wall is too smooth, almost
glassy in appearance, the metallizations will plate to it
but have no adhesion to it.  The glassy condition was
caused by either drilling or the desmear/etchback process
or a combination of both

SEM shots of the hole wall at the step immediately prior
to metallization will tell you what you have

Susan Mansilla
Robisan Laboratory