This night t i was flying from OMDB to FAOR,flying time was 7 hours and 45 minutt,i was going ti sleep and afther 4 hours my autopilot was diconnected O_o and aircraft was not possible to fly...

 

 

 

Specs: Intel I7 4790K 4.4Ghz

            GTX 7802

            8 GB of RAM

           

Could have been caused by turbulence  which caused the autopilot to be disconnected. Cant  see why you couldn't engage the autopilot  again unless you weren't  flying  in a trim state and level. Strange part is  that you came back  and found the aircraft  with autopilot off and still flying   so it must have just happened.

Yeah,but seems like i got OOM after crash O_O i checkd my Memory and was 2.9GB but no error was on my windows screen...

If you would have gotten a oom  fsx would have closed down,  check your event viewer  for  the crash details

have already checked event viewer but nothing have been logged :o