I have also been hit by the dreaded "ghost notes"
My Virus has never been gigged... I use it strictly in my studio and it has worked fine since I bought it. I had to move my studio around and it sat disconnected for about a year while the new studio got built and I connected everything back up and everything works.....except the Virus.
It plays a long sustained note randomly as well as volume going down and bizarre results when using the ring modulator, pole filters, resonance, random bouts of latency etc...
It is heartbreaking because I saved up a lot of money to buy this thing and for seemingly no reason it is acting so unpredictably it is unusable... It happens a few minutes into using it every time. I have come across quite a few posts across the internet by people that have this problem but I am yet to see any solutions....... this was a working system and there have been no changes to any hard or software... I am running firmware 5.1.1.0. The only thing that may have changed are the USB ports I plugged it back in to but I really don't see why that would cause such a massive problem??
Can anyone help? Please? I am desperate to get this working again...