Or perhaps it's normal. I've been playing for about two years, and whenever I get to certain passages, my hand freezes up as if the keys were forcibly pushing it away. It's making me go insane. My hand just does not want to move even though my brain wants it to, then I get this anxiety in my head and I have to stop playing for a bit. I really want to play more elaborate pieces, but this 'thing' is totally restricting me. It usually occurs around 16th notes, but also around passages I have no specific qualms with—just regular series' of notes and stuff. Seems slightly random. I dunno, this is just driving me crazy.