Yes, I had a cell failure on my 2017 which I reported here. One of the cells in a cell pair (#74 if I remember correctly) failed however the car continued to be drivable. Sometimes you could run it in EV mode, other times it would set a check engine light and default to IC operation. One section, the forward most of the three, was replaced several months ago. No problems since the replacement. I guess sometimes things don't work right or just plain quit when new.