I am having similar problems. For some reason, my 4880 has become "finicky." This started about a month ago during a power clean with Piezoflush. The power clean became stuck in an endless cycle. Power off/on would restart the power clean. Finally, and I forget now what I did, I was able to abort the power clean cycle and all was fine.
This week, I purchased a set of Piezo Pro Warm. The installation went fine and my test print, without any calibration, linearization or even a proper paper profile, was beautiful.
Today, I was about to buy the proper software and such but first I decide to perform my normal clean followed by a calibration print -- ever channel was clogged.
Back to a power clean, cycling and new problems -- carts suddenly not recognized (reinsertion fixed that) then an error about Incorrect Carts! I have never seen this before.
So, I reset every cart and that solved all the problems. Printing well again but I am concerned that the Pro ink clogged so quickly.