To be clear, my 2013 never failed, but I traded it in at 66K miles. My lack of faith was bolstered by results of an early C-Max life test, service records attached, where 3 of 4 Hybrids, and 0 of 4 Energi's, had transmissions replaced at ~100K miles, in severe service. I can no longer find the data online, but can offer the attached for your perusal.
For reference, the service records for many other hybrid/plug-in/electric vehicles in these tests went on for pages. There's very little C-Max service that's not replacing wear-out parts. And you may have the 4th hybrid, whose transmission will last. (Energi's have an electric oil pump.)
IDL data 2013cmax HEV PHEV.zip