My i950 has developed a single band about 2cm a the end of a print. It is the same width no matter what size paper I use. It's a band that has a different shade of colour compared with the rest of the print. I read that it could be a problem with the double encoder? I understand that the print speed is slower at the end of the paper. Could it be clogged nozzles? Would a new print head solve this problem?