You don't say what software version you are using (sigh). But, I tried V5.5 and 5.6, and can't duplicate it. If you are not using 5.6, I would suggest you update, and then do the recommended clear setup.
If you are using 5.6, I would suggest that you do a clear setup, disconnect any MIDI connections, and remove any card from the slot. If this does not do it, backup any user programs and then do a "Clear internal programs and setup."
If this does not do it, I'm out of ideas. If the unit is still under warranty you could send it in. It really does look like contact bounce, even though you believe it is not.
