Helloo! So I commented in another topic in the forum how I was done with the A350 and can't be bothered to find the issue, however that was when I decided to take on it one more time but in SU5.
What I found is that changing the navdata for me personally does not work, but not downloading the terrain data helped fix it. Right now, as I am typing this, I am doing a stress test on the A350. Normally it WASMS around 45 mins - 3 hrs into the flight, but it's still going for over 16hrs now since im doing SIA's longest flight JFK-SIN. I still need to test some more if SU5 actually fixes it, but I will report back if it is actually the terrain radar. Also, using charts and the ANF just works fine, and im using Navigraph as my navdata.