I think tunneling can be caused by a number of things. First up is bad construction/improper rolling technique, if the filler in the center is loosely bunched then it may burn faster than the rest of the cigar. Another consideration is tobacco with bad combustion properties; for example, if a fast burning tobacco is used in the filler while a slower burning tobacco is used for the wrapper/binder then you may be faced with the same outcome: tunneling. Finally there is operator failure where the rate of smoking will influence how the cigar burns, too fast and the filler can't keep up and you get a point on the end of the cigar, too slow and the wrapper will stop burning while the filler continues to burn leading to a tunnel.
I dont think the moisture has much to do with it. I would also doubt that under normal humidor conditions that you could have much variations in your RH within the cigar.
It can really ruin the enjoyment of a cigar, so I feel your pain. Just keep in mind that it may just be poorly rolled/constructed and there's not much you can control with rH and temp. Not that I'm not a completely paranoid psychopath with my humidors, but sometimes I just chalk it up to some guy having a bad day rolling cigars.
I just had a Relic do a bit of this. Sort of sucked because it started out with a lot of good flavor but kept burning out on one side thus ruining the flavor. I tossed it half way in... sad, sad, very sad.
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