I've noticed a sudden change in timbre of patches when working with VC 5.0.7 in Cubase7.5 (Mac OS 10.9.1) which I've pinned down to a spontaneous automatic movement in the Osc 2 Key Follow knob to about -32. It's as if some controller message is being sent, but it happens at quite random intervals - sometimes when I'm editing other parameters but sometimes when I've left the sequencer in stop mode and left the room for a few minutes. It can occur even when there are no tracks with data in the sequencer. 
Any ideas what could be causing this?
Thank you
