DesignJet, Large Format Printers & Digital Press

The issue has been ongoing for a year now in which both our latex 360 printers have an uneven band starting from the right hand side and fading half way across the media.

I've nozzle checked at every banding occasion and all have looked perfect as well as doing a alignment check and cleaned the sensors.

I also talked with our HP tech and he believes it's an manufacturer error with the maintenance cartridge contaminating the head at cleaning intervals with the cloth feed not advancing enough to be a 'clean part of cloth', and as such there is no cure except change to a new maintenace cartridge in which the same banding starts happening again within 10 metres of printing.

This problem only started happening after a couple of years with both printers, probably within 4 months of each other, I haven't had any real answer except that the Tech is waiting to hear back from HP about it (this was 8 months ago btw), I just can't believe I have not heard of anyone else having this problem ? And yes I have tried printing with the color gutter to try and help to no avail

I would love a soild answer how this is happening and how to fixed as it is serverly affecting the amount of quality prints completed for our customers.On a textured polyprop substrateon a polymeric vinyl