It sounds like a weird question, but I just don't know how to describe it in words; sometimes you are really good at performing the piece, and you feel enthusiastic and more confident, other times your performance plummets, and your hands/arms are stiff and you're so bad at performing that you just can't imagine the other time you played it like perfectly.
I have been playing the piano for over 10 years, and I have been having this lately, after I started playing virtuoso pieces. In piano competitions, I get told by the judges often that I am playing with emotion and without thinking, and that I rely too much on my fingers.
Is it normal to have such unstable piano performance skills, and is there a way to fix this?