For 8 months or so, sk880 was reliable.

Now, there is a big problem, every once a while, one key gets stuck in hold mode. I find the key and I press it but nothing happens.

Do you know how I get rid of it?

I basically play tons of keys at the same time (layered with multiple thick sounds) and thus consuming all the polyphony and then that sounding note stops.

This is very very bad and very embarrassing especially with live audience. Imagine after you finish your performance, one lousy note is still sounding constantly!!!!

The Keyboard is not acceptable like this.

Any input please or suggestions?