Organic raisins...mold?

I've been buying those individual serving size boxes of Sun-Maid organic raisins for a while now, and in the past two packs I have bought, I have run into a box that has raisins that taste moldy. I wasn't able to see any mold, but they just had that uniquely moldy taste, and I immediately threw the box out and drank a bunch of water.
Has anyone else experienced this? Do you think it's because I'm buying the organic kind? I've never run into this problem before, but it's kind of a waste of money to keep throwing out raisins and I'm wondering if this is common or if I should switch brands.

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