Epson ET8550 printing issue - ink marks on prints

[stephhh]

Hi!

When I print using my ET8550 I have starting having problems with ink smudges and blotches on the bottom or top of my paper. The actual image is fine it seems to be ink drops / trails from the print heads possibly? This seems to happen more when I print at A5 size. I've tried all the maintenance options RE cleaning etc.

Does anyone have any idea what might be causing this? Or what I can do to remedy it?

Thanks