I'm having random velocity problems (MODX7) Random notes will sound at full volume even if you just brush the key - and it will be duplicated all up and down the keyboard i.e. all of the C's. Next time you will get two notes doing the same thing but this time it will two other notes . Right now as I type this - it's my G#'s Today at my afternoon gig it was C and F#. The Velocity setting under Utility is set at SOFT. I have another duplicate rig but for some reason the touch screen will not accept any changes - so I'm in a pickle with both my MODX7's (screen looks normal but you can't change or access anything)
Sounds like a loose connection — you should have it looked at by an authorized service center.