I am taking piano lessons that I have to prepare pieces for, and play them for the teacher. After learning a piece, I usually manage to play it when practising in private. However when I come to the lesson, I make mistakes that I never made before, and I never manage to recover and go on. My hands completely forget what to do.
In the past, I used to play for the teacher (another one) only in graded exams and didn't have this problem. I always dreaded the experience but was able to play the pieces and recover from mistakes.
Is this a known issue? Does anyone know of a solution?
UPDATE: The answers below don't apply to me at all. I have no interest in impressing my teacher. I just want to cope with the course. Actually my interest in music has generally declined after the lessons. Also, now that somebody mentioned nerves/stress, I tend to perform much better when under pressure. In all my exams in the past, I was able to do well in pieces where my hands where shivering through out. One time when I was playing an easy piece in the exam and was starting to get comfortable, my hands all the sudden forgot where to go. (I just started the piece again from the beginning with faster tempo and shivering hands.) Also, in my first lesson with this new teacher, my hands were shivering, and I played what I knew as I wanted to play it.
I don't understand completely why this happens to me. But, I think my coping strategy would be to just shiver my hands when playing.