My sister did a little bit of instructing in the DA42 a while back and had a partial engine failure on one engine on more than one occasion. I thought they got all that worked out though with some AD's, but perhaps not! I also spoke to a ERAU student who once got the engine fire warning and had to shut an engine down in IMC... Sounds like the DA42 has some issues. It's a great airplane to fly when it's working correctly though!