Bread-Bakers v102.n057.3

Perhaps someone can tell me why the bread I freeze doesn't rise nicely 
after freezing.  I usually make bread, let rise the first time and punch 
down. Then freeze on cookie sheet til frozen and vacuum seal.  I've even 
tried two rises and punch down, then freeze.  Then I thaw in fridge or 
counter.  But when I bake, I get small heavy loaves.

Any help would be appreciated. Thanks, Vicki