Why is my right headphone clipping?

I’ve had a pair of Audio-Technical headphones for about three and a half months. I really like them and they’ve been working great. However, I recently noticed that when some bass notes play, there is some distortion in the right channel. I get that kind of thing in my car speakers too, but I’m used to it. ... show more I’ve had a pair of Audio-Technical headphones for about three and a half months. I really like them and they’ve been working great. However, I recently noticed that when some bass notes play, there is some distortion in the right channel. I get that kind of thing in my car speakers too, but I’m used to it. These headphones, on the other hand, we’re fine, but now the right headphone sometimes clips a little. What causes this and what can I do to fix it?
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