Piano Forum

There is this piece that I had no trouble playing for a few weeks including yesterday, especially the supposedly technical part where you do the C major arpeggios and scales downward (the Rondo part of Mozart's Sonatina). Then all of a sudden today I could NOT at all perform the piece to my previous standard, I kept missing notes at the same part where it gets technical, even after 4 quick run-through's for the sake of warm-up. This worries me. Am I learning the hard way that progress on the piano isn't always linear? Do I give the piece a rest, or do I just keep practicing until it clicks again for me. Slowly, quickly, or alternating between both?

Cheers.