Any other with this problem?

[Kankkis]

I start up the game, first launch crosscountry, i got steady 60fps with Vsync, really smooth, no microstuttering at all, really enjoyable flight.
Then i goto other missions, London sightseen etc etc.
Then i launch crosscountry again without game restart and i got 30-40fps with microstuttering, not enjoyable flight anymore.
FPS checked with FRAPS, and i see that FPS reduce right away with my eyes too, it's not smooth anymore.

No changing any setting bethween flights?

This is really strange behauvior.

Kankkis