I'm not clear...
Did you do the VST reset? Check link.
Did you do windows update
What specific version of Sonar? CCC up to date?
What specific version of AD2? Latest patch?
What version of mix control... 3.6?
Do you have issues with AD2 standalone?
Tell us how you have set up the driver in Sonar preferences. Main thing is to make sure you don't share it with other apps.
We can take it from there... Hopefully....