Printing Problem!

After printing a few photographs for a portfolio I am building, my printer has decided to do THIS to my images.

http://s9.postimg.org/lab8uyhhr/DSC_0066.jpg

Any ideas to what's happened?

Out of blue ? Clogged print head? Which make and model ?

I changed all four cartridges less than a week ago, and printed an image the same day with no problem - yet about 4-5 days later this is happening.
It's an Epson SX420W.

Not something I've seen before, but I doubt it's ink levels. If it started part way down a print and carried on from there, yes, but it seems to be happening at the start and end, but fine in-between. Which makes me wonder about paper transport, rollers dirty, etc.

I suppose maybe a dodgy cartridge is possible. You could try creating a test page in a graphics or photo editor, with several small blocks of colour, say an inch square, one of each cartridge colour. Then put a row ofcthese at the top of the oage, then copy it at put the copy at the bottom of the page. And print, and see what happens. It might narrow the field of options a bit, Also, do you always get the problem at the same point, or does it vary?

Oh, and I suggest small blocks of colour purely to do several test pages without wasting large amounts of ink.

Seemed to have fixed it with a simple Driver Update!
Thanks for the help, perhaps this print was just a one off to tease me. If so, I'll give the "colour block" test print a whirl!

Thanks :)