Sounds like a minor defect in the pot. If the warenty if out (and if you dare) you should be able to change it yourself. Only do this if you know how to solder and know a minimum of eletronics. Else take it to repairs...
Disclaimer: Performing this is 110% at own risk and i can NOT be held responsible for any damage inflicted to your Virus, your mental health or any other thing that might suffer damage from this operation 