This post not about ipf5000, but Canon printhead experience. My W6200 working about 26 months since head died this week. I service manual say that head life is 2200 A1 copies. In printers system info I found ~1800 meters print and its ~2050 copies A1. In head info - head life 847. I mean, full heads life is 1000 (MTC full life is 1000). In all of my printers heads life, he is not been clogged. Only last few days looks like he is clogged, but really life is ended. Really he looks like a new.
Where is hint, why he died? Suddenly.