its a common side effect Im afraid
2-3 mgs a day is not a lot after ten years. I'm sure your body has built some tolerance to it. If you have been taking it for ten years, why are you concerned now? Have any other meds been added? Is the sharp decline just happening or did it start ten years ago. If it is just happening, it's not the Klonopin.
I'm replying because I take 1 mg a day of Klonopin. I have been taking it for a little over a year now. I have not experienced any decrease in libido. I also take Wellbutrin and it also has the least amount of sexual side affects...one of the reasons I stayed on it. I think, though, that if I was on 3 mgs daily of klonopin, I would be completely zoned out and not be up for much of anything.