Gentleman, I did try it again today and I noticed the A/P starts acting up at the end point of a SID. I startet from EDDB RWY 07R with the LUROS1Q Dept. That's a long SID and 3/4 of the distance I reached 20.000ft and all was normal. Exactly when I reached the last waypoint of the SID (LUROS) that was the last turn the A/P made. After that the plane did not respond to any HDG input nor to the programmed flight plan. So it seams he flies the SID's perfectly but has problems with the flight plan. This time I entered the F/P via Simbrief but it does not make any difference, the very first flight I made with the 310 I entered the F/P manually.