QSS 2901 Enlargement Print Problem

[aliz]

Printing are ok in all sizes but when we print enlargements 5x12,10x12 & 12x16 almost printed picture are ok but after 10 or more Continues enlargements printing one of them are not printed good.

PLease see below link of picture.

http://i389.photobucket.com/albums/oo336/alihzaidi/pic.jpg

This Picture Printed 5x12 size.75% area of print ok and 25% print area with green and some lines.

I attach only 25% print area for your understanding if you want to see more picture then i will upload.

This problem is not on every enlargement prints if we print 50 in a day then 2 or 3 printed are not good.