Intermittent problems are damn annoying...
It's the loss of confidence in the keyboard performing properly that spoils an otherwise relaxing and fun gig.
Maybe someone on Korg forums will have an answer or a fix.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.