I noticed in the manual that it clearly states the Virus needs to be on a flat stable surface. Up until now, I had the Virus on the second tier of my stand where the metal bottom of the Virus was laying across the two metal arms of the tier, possibly causing some vibrational issues.
So if I get you right, to replicate the ghost notes bug, one could simply take his powered-on Virus and shake it in his hands? I'm asking this because I think rather than find a condition when Virus does not exhibit the problem (which might be simply a coincidence and thus we can't be sure) we should search for a reliable way to reproduce the bug...