I turned the printer on Saturday, printed a nozzle test, all was clear, made a small print and turned the printer off. Sunday, I turned the printer on, printed a nozzle check, PK was clogged, performed a normal clean, let it sit for a few minutes, made a small print, printed a nozzle check again, PK still clogged, repeated and all was clear. I called Epson this morning and they're sending another printer. Hopefully, this one will be THE one. It's very strange, I've pondered whether it could be environmental but I come back to the fact that my 7880 and 4900 are in the same environment and the 7880, while being behind a generation doesn't have nearly the clogged nozzle issues my 4900s have had.