It could just be a dirty volume control. You probably need to clean and lubricate it using something like [[url=http://[/URL]="http://store.caig.c…"]DeoxIT® Fader F-Series[/]="http://store.caig.c…"]DeoxIT® Fader F-Series[/] which you spray into the control and it cleans and lubricates it. You could also have problems with the soldering of the potentiometer to the circuit card where one or more solder connection are not well done and will have to be reheated or reflowed. You could also have a defective volume control which has a broken track which means you would have to replace it. If you don't have the technical chops to repair or clean it yourself you will probably have to send it back to the manufacture or find someone locally that can do the work for you. Hope this helps...

Best of luck!

I have found the PreSonus line of equipment to be very well built. So this is an extremely dirty potentiometer and/or, it's broke? Opening up the box and squirting junk into the control is just a Band-Aid. You can be pretty much guaranteed that it will do it again and again and again until you replace that control. What it really needs is an ultrasonic cleaning and that's not really tenable for you. In fact it's downright impractical about 70% of the time. So the spray cleaning Band-Aid is the most logical to try and shoot it up with.

It's a real bummer to have dirty intermittent potentiometers
Mx. Remy Ann David