Ink is fading fast while using brand new ink...

Question

I have returned 3 brand new ink cartridges because after using each one to print only 5-10 copies, the ink started coming out faded on the paper. I would take the cartridge out, shake it and put it back in, making the ink look darker on the paper but not for long. Then I would exchange that cartridge for another and so on. I am on the 4th cartridge now and it is doing the same thing. It must be a problem with my Canon printer--help!Debbie