First of all thank you for this nice plane.

I realized some little issues.

First: 

If I put in the arrival (STAR and RW) during flight the NAV will lost. I've to DIR TO to next waypoint. (Tested 2 times)

Second:

Some times during flight AP and AT are disconnected without any actions from my side.

 

third:

Capture LOC and GS (ILS approche) are very tricky. Some times the plane captured both on the third try to land.

 

No bis things I guess but a little bit annoying.

 

Best regards

Frank  

Frank, did you re-sequence the waypoints after loading the STAR (moving the current point to the 1L)?  Did you execute the route change/ then DIR TO?

What waypoint were you at and which STAR did you load?

 

Thanks.

This happens on the real airplane too- if you change the STAR/approach, it will leave a disconnect sometimes between the waypoint being currently flown TO, you must go to the legs page and manually clean it up. It comes into play when ATC changes our arrival runway from the expected 8L to 9R in ATL, since it changes arrival waypoints, for example. 

A good way to mitigate this is by having an alternate arrivate selected in route 2- in that case you can simply switch and "direct to" what you were flying towards- which will eliminate getting that disconnect.

Sorry for confusion I meant that I have to press the NAV button located at the glaershild again after putting in the arravial.

Has nothing to do with the LEG page and any discon. The plane simply lost the NAV path.

 

 

Frank, you have to be on an intercept path to the NAV course.  You probably got the YELLOW nav arm in the FMA but it never turned towards it.

Other planes I have flown will take a 45 degree cut towards the NAV course.  Unfortunately the 80 was built prior to those.  The pilot has to direct the plane towards the magenta line in the 80.

I must say, on a flight today from PHX-PSP, I had the same issue.  I was in cruise, on the Magenta line.  I was in the process of putting my alternate airport and route from PSP-ONT into the RTE2 page when overflying a waypoint on the active RTE1.   Upon crossing the waypoint, the aircraft started a right hand turn as if to try and turn back to the waypoint it had just passed.  Sure enough, the prior waypoint was still in the 1L position on the LEGS page, forcing me to do a DIR INTC to the next waypoint that should have automatically switched over.  I will be testing this very closely the next couple of flights as this is the second time this has happened to me.