when the aircraft is in route, sometimes behaves strangely, begins to move from side to side and in the drop down does not respect that I give, any solution to this problem? I tested to see if it happened without activating the sky and I only turn on when this goes on, thanks, I use Active Sky evolution for fs 2004 For more information i use the Airbus 319 , 320 pss , i need a special configuration or something Thanks for your answers , i hope write this letters fine because im from Mexico

You need to be a little more specific. When you say your aeroplane moves from side to side, do you men rolling? Three things that would affect the aircraft's stability with the AP turned on would be turbulence, flying too slowly or flying too fast.vololiberista

Hello Voloberista im going to try to explain and thanks for your answer , its over 30.000 feet and speed of .78 mach -.80 mach

That would be about 295 IAS which sounds ok for that FL so does it happen at any altitude, any speed or only what you've quoted. You need to check your manual for weight allowances. It could be that you are too heavy to be flying at FL30. If you take off at AUW you can rarely get to your final cruising altitude until you have burnt off enough fuel.vololiberista