The sound seems to happen when EQ is running, regardless of character or zone.
I'm afraid the second question exceeded my technical know-how. That the sounds only seems to happen when EQ is running might be a red herring, but it seems like a strong coincidence to me.
It starts after I've been in the game for some time, not right away, then repeats regularly. I did check my windows system sounds and it's not one of those.
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