Hello Chris!
I have an Evo160vx and an Evo170VX that can be a 140-160-180. I think this is the engine that you are talking about. To me, it sounds like a software update, or you need a new fuel pump. Make sure your fuel pump voltages are set correct too. I would get in touch with Arno in Germany, since there aren't that many here in the USA, and there are no longer repair stations in the USA. I am sending my 170EX back for new bearing this month after 16 hours of flight time in the same jet, no wrecks.
http://evojets.de/