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It is probably because you've used it for so long. It's most likely not the stylus because if it works fine in the others, then it should work fine in that area as well. It's most likely because you stab the freaking thing so hard, and you don't really treat things so well.
You can get some super glue and a small stick, like a lollipop stick, maybe a cleanly broken toothpick. Place a little superglue on the toothpick and carefully place it onto the stylus, without letting it touch the edges of the hole. Simply remove the stylus.
You can use rubbing alchohol and a cotton swab to have a try! Wish my answer help you!