I have a problem with the a319 Professional that keeps coming up. Shortly after I initiate the descent (turn in new altitude and press the button) the plane goes into a nosedive. In the Perf Page it doesn't go from CRZ to DES but to the CLB mode. After that the flight is messed up, because I can't get the plane out of the CLB mode anymore. The installed version is 1.2.2.0. I have the problem with and without FS2Crew and also with the internal Checklist (Copilot on). The FMC is set up perfectly.