Hello,
I use FS2004 and CP757 professional.
I noticed one unpleasant problem during my flights over Europe.
Once flight direction is set-up (either through autopilot or via FMC) the plane follows it right but time to time the heading suddenly change (sometimes even more than 40 degrees). The autopilot tries to get back to track so start turning. After a while the heading changes again back and autopilot again follow track and turning back.
Initially I thought it is due to strong winds but it is not the case.
It looks like heading compass changes itself time to time there and back.
Do you anybody from experience pilots have the same issue ?
Is it FS2004 issue or CS757 issue or some of my fault ?

Any advice appreciated
Many thanks
regards
JM