Wow, I have never seen this before.
I was printing a 36x48 canvas and half way down, it started to leak black ink on the canvas - first from the left side of the image and then 2" strips all over the image as it traveled. I thought the maintenance tanks are too full but usually the printer has a warning for that. All I can say is that, I have had to run cleaning cycles often the get the nozzles to be clean recently.
I moved the head to the left side and cleaned as much ink as I could. It's leaking from the right edge of the head - not from the nozzles.
Any help would be greatly appreciated.