For the past few months, I seemingly have gotten very bad at biting my cheek and lip while on a block and I don't know why. Does this happen to anyone else?

For the past few months, I seemingly have gotten very bad at biting my cheek and lip while on a block and I don't know why. Does this happen to anyone else? I did not use to have this issue. I've stuttered since I could speak, and I only remember this being a problem for the past few months. It's particularly annoying because not only am I stuttering but I am also causing myself pain.