Flight completion

I have tried numerous times to complete a flight from KHFD to KORD in the Cessna Longitude.
Problems: Using only vs to adjust altitude: ATC keeps telling me to climb to ie. 220 alt when I am already at that altitude; The glass cockpit locks up two thirds of the way through the flight. Try to manually adjust altitude and plane goes out of control. Will these things be fixed in the next update.
I know that the Longitude has stability issues but I have encountered the above, has anyone else?