No idea, but I'm wondering if it's a file issue and not a printer issue? I'm curious to see the consensus.
I had a customer with the same problem yesterday. Check your encoder strip. Even if it is perfectly clean, is it cloudy? A good encoder strip should look very clear. The spacing and frequency of the banding looks like the encoder is just getting inconsistent data. If all looks good it could be a head or damper issue.
It could be many things
what wave pattern are you using?
did you try to clean the encoder strip?
you did a slant check... looks good?
For some strange reason Mutohs have a hard time with certain colors. I print out full PMS charts and on certain blues and greens some colors will have vertical lines and a color right next to it will not.