I'm sure this is not a big deal, but I'm getting a lot of static when I roll the volume pot up or down on my new Ray 4.   I tried cleaning it, but it didn't seem to work so I swapped it for the same one at GC.  Second one has the same problem.  Probably built on a Monday.  Is this common and shoud I have a tech. look at it?  Love the basss otherwise!