This 60 level wizard seems to drop dead in the middle of the desert for no good reason. What caused this?!
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It's a bug. When the wasps shoot projectiles at the edge of the screen and you move so that they disappear from your view, they will become invisible. But they can still kill you.
Here's a thread about it on the Diablo 3 Hardcore forums. The author of that thread also linked to a video where you can clearly see the bug (he tested this on SC):
Update as of Patch 1.0.3:
According to the 1.0.3 patch notes for Diablo 3, this issue has been fixed: