Do a System Reset. Go into the Function Menu/Utility Menu/System Reset Tab and execute the Factory System Reset. PS: Back up all files (User Midi's, Styles, User Voices, etc. that you want to save first).
Let us know if that works.
Best regards,
Mike
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Yamaha Genos, Mackie HR824 MKII Studio Monitors, Mackie 1202 VLZ Pro Mixer (made in USA), Cakewalk Sonar Platinum, Shure SM58 vocal mic.