Dying Branch on Healthy OD Plant

Ok, I have one branch that is dying on one of my Silver Hazes... no other part of the plant seems to be bothered... just the one branch.
I'm sure someone else has seen this, I have on other plants but, I have no idea what causes one branch to die not effect the rest of the plant.
I'm not complaining, it could be worse, I would however like to have some idea what is causing it.
There are no breaks, no damage, the only thing I can see wrong is a few scrap marks from the plant rubbing on the cage a bit... should not be a prob.
So, what do you think?
I can provide pics if need be!
 
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