Keyboard Backlight Weird Malfunction

Hello, first time poster here!

So, a couple months ago, I noticed my keyboard lights would occasionally flicker - which was mildly annoying unit it seemed to mysteriously stop. However, about a month ago (anecdotally around the same time I installed the El Capitan beta), I began having a strange issue where every other light of the F-keys (others are affected but most apparent in F-keys) is dimmed.

This problem also seems to be occasional and random. Putting the laptop to sleep and waking it up temporarily fixes the problem; but it always comes back. I've tried resetting PRAM, which has been no help. Countless Google searches have brought me nowhere, and I'm still not sure how widespread an issue it is.

I'd greatly appreciate any help you can offer.

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