Time to do a nozzle check.
Mine plugs at times. Don't know where the idea the 3880 never clogs up or plugs up comes about. Usually mine is the Vivid Magenta, and the Matte Black which is mostly unused. Sometimes one cleaning cycle, let it sit for a few hours, and a second nozzle check shows it clean.
I have 4 printers. I need to run all of them once a week else one may clog. Even happens with watery dye ink printers as well. Personally, I'm a bit leery of Epson for clogging issues over the Canons which have user replaceable heads (Which I've changed out.). Something Epson needs to address, imho. I had a wide-bed 13" HP with separate heads for each ink cart, but the cost to replace all heads and all inks was atrocious against the new printer price so it went into the trashcan.
SG