I think you should write to the Customer Care department and document your 'troubles' with Flight 126.
As an aircrew who has worked this flight a couple of times this summer, I noticed that people were coming up to the podium frantically asking where Flight 126 to Shannon departed from. The FIDS monitors and the gate podium board showed Flight 126 to Dublin, but did not mention the Shannon leg. If I were a passenger looking for Shannon on the FIDS screens, I wouldn't even think to look down in the 'D's for Dublin (most didn't know their flight to Shannon was a 1-stop through Dublin).
In any event, I submitted an ops report and within a week the problem with the FIDS screens and departure gate boards was fixed. Apparently the round-robin nature of this flight has given the IT folks some challenges and they have to make some interim code changes within the system.
Sounds like your experience is another indication that they still have some tweeking to do. Again, I think you should document it and send it in to the Customer Care folks........ @:-)
RWD