Ray Ban 2132 making noise when I put on/take off?

First off, I know that the frames are plastic and such. I bought a pair of RB wayfarer 2132 earlier this month and I noticed every time i take them off or put them on, they make a crackling plastic noise of some sort. It's in the lens area. So my question is, are all of them like this? Or should I go get an exchange. I have a 90 day warranty with the store.