I have experienced what you described when using a controller where the sliders were programmed as MIDI switch controllers instead of continuous controllers.
You need create as basic a setup as possible and work up from there. I don't know whether you were using the same controller when you had these problems before, or even if you are having problems with the volume knob when using MIDI, audio, or both.
I suggest disconnecting your controller, rebooting your computer, opening SONAR, and creating a new project. Do not include any control surface plug-in. Try recording audio and then seeing if the volume control works normally.
This is a situation where support is often the best choice because it is essential to ask follow-up questions, as I am doing here. I do not know where you are from so don't know if calling is difficult for you. Meanwhile, we can keep trying...but more information would be helpful.