I think there are a couple of things going on here.
Playing the Wavedrum on your lap is most likely one of the more "unstable" environments for the instrument, especially if you're playing aggressively with your hands. Lots of moving around, even if slight, is probably putting some stress on the inner-workings of the Wavedrum. Not that this shouldn't be an option for a playing position, but just be aware of the extra care that one might use when doing so.
As far as sudden changes in programs:
It has happened to me too, but very rarely. However, it has never occurred during a performance or live demo. When it HAS happened, it's usually because I was playing very aggressively on the rim, with the shoulder of a stick, in an area close to the main controls. Considering that we are pounding on the very structure that is also housing the electronics, it's not entirely surprising that it could occur occasionally. BUT...
Is has only ever happened when I have randomly dialed up a program, as opposed to playing a sound that I have stored in "
Live Mode"
That is:
Bank A, B or C.
And one of the location points:
1,2,3 or 4
Live Mode seems to stabilize the sounds a bit. This is also perhaps why it has never happened to me when performing, as I am usually in Live Mode.
Just think of the Wavedrum as you would any other "real" instrument. Have fun with it, play passionately, but keep in mind that it is not just a garbage-can to whack away on.
A little finesse will go along way!
but after softly going through the patches just to hear them I started really lay into it ( with hands and the wd on my lap) on patches I liked only to find that it seemed to randomly changed patches..!?!?
