I wonder if anyone can help. I have a Tyros5 76 which I love. However, recently, there is a problem with one single key G in the octave about middle C. Some of the time it is fine but then for no reason, it sounds loud (as if it has no dynamic control.) It is VERY annoying and is spoiling my recordings. I wonder if it is a software problem or a key contact problem. Does anyone out there have any idea? Hope you can help me. Charlie.