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FF777 descends on it own after 4 hour flight and VNAV was of

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Hi everyone;) 

Yesterday i started a flight in b77W by Flightfactor. It was a flight from San Francisco to Frankfurt so around 11 hours. Everything was fine until climbed to my cruise altitude of FL310. As i reached that FL the aircraft climbed further it self. so i was forced to use V/S FPA to decend to my planed FL310, which was also my optimum FL as i read in the VNAV Page. After that incident i turned VNAV off so i pressed the VNAV Button on the AP Panel. Around 20 Minutes later i climbed to FL330 because that was now my optimum FL. Around 4 hours later the aircraft appears to descend by its own like i can see it in the Volanta statistics. It happens while VNAV was turned off!! So i dont know what to do because i loaded enough fuel for that fligt. 

Did you have this problem too? Or how can i fix it? 

pnZqbnP2p

 

I've given up, almost since I purchased it long ago 😕

An update for XP12 and new version is announced since a long time, but so far nothing that I know has been released.

Learning to fly gliders since 1980

Stopped using flightsims for good since early August 2026, after 34 yrs using some really great specimens... If I'm asked to name the preferred one, after all these years, MSFS 2024 is my answer without hesitation.

(No desktop :-// after the last one crashed for good, so no simming, but I keep polling AVSIM - my main ludic activities spot since around 2006...)

8 hours ago, FrequentFlyer said:

So you have the same problem?

 

That and many others....

Learning to fly gliders since 1980

Stopped using flightsims for good since early August 2026, after 34 yrs using some really great specimens... If I'm asked to name the preferred one, after all these years, MSFS 2024 is my answer without hesitation.

(No desktop :-// after the last one crashed for good, so no simming, but I keep polling AVSIM - my main ludic activities spot since around 2006...)

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