Vortex / Kronos2 - Note sounds forever

Hello, my problem is this:
I plug & play the vortex to the usb midi ports of the Kronos 2. It immediately starts to ring and recognizes all the changes that are configured. The problem is that every time, when playing, a note is sounding (like that at some point the note midi is tight forever), you can keep playing but that note was left ... and there is no other solution than to change sounds in the Kronos to turn it off ... (turning off the vortex does not happen, because the sound that tightened on the kronos).
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