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		 I would definately check the line amount.  Casting and such I'm sure has an effect, but 99% of the time if I have a problem it is right after a line change.  I yank off a bit of line and the problem goes away. 
 
 As a note... I always close a bail manually (if the reel has one) and give a tug to make sure the line isn't looped over the spool.  This becomes a second nature auto pilot kinda thing... Generally have no knot problems less those described above 
		
		
		
		
		
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