Toner black 12500 pages replaces Kyocera TK-3100, 1T02MS0NL0 Toner cartridge for Kyocera ECOSYS M3040DN, M3540DN, FS2100D, FS2100DN

This is a downgrade and rewrite of my previous 5 stars.One unit failed, suddenly, to put toner into the printer. Still half full!I used other toner in between.Now - Just put new unit in printer. OK at first but when I reached to pull out some printing, to fold, both sides faded to produce a pale bar of hardly printing.Swap to another new unit. Speckles when printing document containing photo and some black area. Simple printing ok.Now I have wasted my money and need some toner, from elsewhere, very quickly!