PMDG 747 unstable behaviour

[Eziocin 46]

After many years of operation in FS9 with the PMDG747, I have recently moved to FSX, and I am experiencing a strange behaviour of the aircraft during long haul flights: after a few hours of flight the aircraft starts to become unstable, in terms of route, altitude and IAS (cruise conditions with AP ON, LNAV and VNAV). Everything starts with a strong turn diverting off course, and the consequent turn in the opposite direction at high bank angle to return on track, and so on... This goes on undumped and usually if no action is taken leads to out of control a/c in a very short time During this turns, there are also uncommanded IAS reductions with consequent thrust increase to regain the lost speed.Disconnecting the AP and flying manually resolves the issue but after reselecting AP ON in few minutes everything starts again.I say again, this only occurs after 4-5 hours of flight.Anyone else experiencing this ?Regards

[Eziocin 46]

Sorry guys....didn't notice there was a similar topic a few lines below...including the solution....forget about this postRegards