- For me its as follows (it happens randomly, not always, means sometimes no probs in such situations):

- when ditching or when taking off and looking on my 6 (probably caused by dust effect) - this one happens very often
- when more planes are around me in intensive dogfight (this I only tested online) - sometimes
- when Im low over cities - this one is really rare
- when a plane explodes in front of me (near me) - sometimes, but more often than No2

apart from that game mostly runs smoothly with a bit reduced settings...

pls share your experience...