I don't know anything about this issue, but I can speak about EvoJet from personal experience. I've owned two and a very good friend has two as well. Neither one of us has had a SINGLE issue with the turbines and we fly A LOT. The power they put out is above the advertised specs and the throttle response seems more like my Desert Aircraft gas engines than a turbine. I have owned turbines from Jet Cat, EvoJet, and now Kingtech, so I have no skin in one particular manufacturer.