Checked the spread between pins in the V3 connector recently? My money's on the V3 power cable / pin. Power up, record, and gently jostle around the power connector to see if you can duplicate the issue. Regardless of duplication, I'd pry the pins apart ever so gently to get a bit more of a gap and ensure a solid connection between the pins and the center of the power plug.
I don't know of a way to fix it other than to remove the offending section and crossfade. Or, just leave it (which is probably what I'd do).