[B]Bottom Leaf's falling off help[/B]

The bottom Fan leafs and some of the leafs on the branches that branch off on the bottom part of the plant are just falling off not dieing just turning lighter green and falling off very easy if i touch the leaf with the tip of my finger it will just fall off is this normal only the leafs at the very bottom of the plant are doing this?
 
im only at my second week of flowring i just took a video and most of the leafs fell off but one last leef was left on a branch and i poke it and it just falls right off clean ill post it in five minutes
 
its not only the big fan leafs the new leafs that grow off the branches that are only small and just started growing fall off also only few of my fan leafs are falling off i will post a video of a new leaf falling off when i poke it
[video]http://s775.photobucket.com/albums/yy40/zack567567/?action=view&current=DSCF6693.mp4[/video]
 
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