April 22, 201412 yr Hi all! So. In every flight with PMDG 737NGX im getting an problem that destroys my flight. After departure and when i reached my final altitude everything is fine. LNAV and VNAV is on such as Autothrottle. The plane is following the ''Purple line'' on the navigation display and everything works perfectly until about 70-100 Nautical Miles (NM) from Top of Descent (T/D). My plane starts to fly it own way and its not following the Purple Line. Then the plane starts to descent slowly and after a while it starts to climb again above my Maximum Altitude. Its like rollercoaster. I tried to disconnect LNAV and VNAV and CMD A (Command A) and sets up the plane right. I then turn LNAv and VNAV such as CMD A. It dont work, the plane does the rollercoaster and won't follow the route correctly. What am i doing wrong? I've set up everything right (I think) and have watched many YouTube flights from famous YouTuber's and flown them myself but still getting the problem. Anyone out there who has/have the same issue? Here are some screenshots at my situatuon. http://gyazo.com/ded79aad6fcf7201ec3dacf958a7b2da http://gyazo.com/a0375bd940e5f423b66f522e811dbb3f Thanks!
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