New 3DS XL B button not registering with normal pressure

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I got the system 4 years ago, but barely used it at the time, and only recently started using it again. Today I was playing Zelda and noticed the B button wouldn't register unless I put a couple notches more pressure than I normally did. I was playing Kirby and Smash Bros on it the past couple weeks and didn't notice this, and it seems like it did indeed just start happening because now every time I start playing again, my B presses won't register until I remember I have to put extra pressure on it.
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What's going on? Any easy way to fix?

submitted by /u/redvibes99
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