This just happened 3 times a few minutes ago while flying a 110 in the Titanic Tuesday arena. In the vicinity of A72, no enemies in sight, gaining alt and just looking around. No stutters, no symptoms, just "AHII encountered a problem and had to close".
I had no problems anyone else wasn't having in the beta version and haven't up till now through patches 1 -3 in the release version. Nothing has changed on my end.
MSI P7N mobo
E8500, 4 gb ram
GTX260
Win XP sp3
The first occurance took about 15 minutes. The second and third less than 2 minutes. I've shifted to and have been flying in Mid War now for about 10 min w/o any problems so far. No reboot in between, just re-launched the game each time. Just FYI, I don't have a clue.