Yamaha S80 stealing middle notes from jazz chords?


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I noticed a weird problem with my 15 year old Yamaha S80. When I play chords like the one below, it intermittently kills one of the middle notes a moment after it's started sounding. Even weirder, sometimes it sends a second Note On immediately afterwards, other times it doesn't. In the example below the misbehaving note is F3, and below that it's the A3. As far as I can tell, it's never the top or bottom note. At first I thought it was my cheap MIDI-USB interface, but I can't see how the interface would be smart enough to pick out notes from the middle of chords.

Has anyone seen anything like this? It happens intermittently. I'm not holding down the pedal or doing anything I know of that would bring the instrument near its polyphony limits. Besides this, I really love the piano action of this keyboard.

01:18:09.662 From USB MIDI Interface Note On 1 D1 53
01:18:09.686 From USB MIDI Interface Note On 1 C3 68
01:18:09.687 From USB MIDI Interface Note On 1 A3 47
01:18:09.698 From USB MIDI Interface Note On 1 E3 68
01:18:09.700 From USB MIDI Interface Note On 1 F3 66
01:18:09.742 From USB MIDI Interface Note Off 1 F3 0
01:18:09.776 From USB MIDI Interface Note On 1 F3 20



Screen Shot 2015-01-24 at 1.23.28 AM.png


01:40:46.795 From USB MIDI Interface Note On 1 E3 50
01:40:46.801 From USB MIDI Interface Note On 1 F1 41
01:40:46.803 From USB MIDI Interface Note On 1 C4 56
01:40:46.808 From USB MIDI Interface Note On 1 G3 51
01:40:46.822 From USB MIDI Interface Note On 1 A3 39
01:40:46.908 From USB MIDI Interface Note Off 1 A3 0
01:40:46.912 From USB MIDI Interface Note On 1 A3 16


Screen Shot 2015-01-24 at 1.47.45 AM.png
 
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Try reloading the O/S. If it still occurs it could be a hardware issue. But start with the software first.
 

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