Hi all,Since last week I do have a strange error. When I use the level D 767or PMDG 737 747 and check the FMC with fuel weight and speed and so on, so far so good. So I taxi to the runway, and when I take off I usally arm LNAV and VNAV and the AP, even so the FD and the A/T. No problems, But then the AP is suddenly disconnecting and the plane is uncontrolled going down. I'm desperately reformat the partition installed everything all over again. But the problem still exists.Cheers, Teun

Hi Teun,I think you have better chances to get an answer in the PMDG and Level D fora.Wolfgang

Do you have Active Sky and a Traffic add-on installed. You may be flying in to the wake of a departing aircraft. You can disable wake turbulence in active sky or keep your distance from departing or arriving aircraft, if this is your problem.