[url=http://www.bungie.net/News/content.aspx?cid=31738]Bungie Mobile FAQ[/url]
Let us know if that doesn't cover all your questionable needs.
:)
[Edited on 01.24.2012 1:22 PM PST]
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I've had this happen to me a few times, but it's only happened when I lose service. Which is only really when I go from 4G to Wi-Fi during that two or three second down time.