Epson P6000 'Skipping Ahead' During Prints

I hope someone can give me some insight into what’s happening with my P6000, Epson support has not been any help whatsoever… It’s hard to explain exactly what is happening but during printing the printer is jumping ahead about 1" leaving a light band across the print. It picks up printing again normally but along with the light band there is a double image which confirms it’s nothing to do with clogged nozzles… For example, an 8" x 10" image ends up being 9" x 10" with missing section in the middle…Any thoughts as to what would cause this?