Not sure. Was my first flight with the A310 in MSFS, I did many flights with it in XP11, never experienced this issue. I read another thread here in the forum, which sounds very similiar to me:
I did a flight from Berlin to Anchorage, the first seven hours, I checked the PROG page several times and it worked well. But then the FMC completely turned black after clicking the PROG button and all instruments were frozen. I did an emergency landing. When I used speedbrakes, I could see/hear the vibration from my FS Realistic, but the speedbrakes were not deploying visually. FYI I flew online on Vatsim and I used RAAS Professional and FS Realistic.