I haven't tested afk fishing either (or afk combat training) but I definitely know if you're autopathing it'll crash within a few minutes. If you're standing still then you're fine. And it does the same thing for me - the BDO icon will remain in the tray until I move my mouse over it and then it'll poof. I have noticed, however, that the Xigncode icon will vanish when the game actually crashes. Also still having this issue.