Yes, I also used Knock-offs on my Canon i960 and it worked good for a long time but then started to give me problems like you. I changed to genuine Canon Ink and it solved my problem. Then I started to get an Error Light about the Sponge talked about, and that the Printer had to go back to the Manufacturer. So I decided to get a new Printer, and I had been looking at Lasers. Canon had some on sale for under $300, so I bought one and it was a good decision. The Color Toners cost more, but they last a long time. If you do a fair amount of printing, you won't be disappointed. They have Ethernet Networking too, very solid.