I'm a bit confused about the orientation. I'm even more confused about the photo paper strip. Anyways...
Is the issue that each pass of the heads only prints part of the image, so the whole time you're seeing it print wrong?
Or is the issue that it looks like it's printing fine, then suddenly quits like 1/3 through the job?
If it's the first issue, sounds to me like you have a mismatch on paper width somewhere. When I first got my 9900, I was confused about length/width, portrait/landscape. I had a few situations where my incorrect settings led to it not printing left to right wide enough, since the settings made the printer think the media was less wide than it really was. It knows enough to try to not print off the edge, but it doesn't know enough to not print in the first place since it won't fit.
If it's the second issue, sounds to me like you're running out of hard drive space. I have seen the Windows print spooler many times run out of one of these resources, and just stop spooling -- rather than erroring out -- which leads to the printer seeming to suddenly stop in the middle of a job that was going well. Learned to leave plenty of space on my drive.
Of course, it's always possible neither of these are your issue. My printer periodically does things that make me call it a moron, and others have the same experience. But, you shouldn't be having anywhere near a 1/3 waste issue die to the printer acting badly...