The app isn't the issue for me, it's using the mobile vault that starts up the weasel plaque.
What I found that helped is unplugging the power brick and plugging it back in after a few seconds. This issue for me was on Xbox One using the Destiny Companion app on ios 8. Worth a shot if you haven't found a solution and want to try this out.
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Great, thanks for your input! I've noticed the same thing, when I try and grab something from my mobile vault I usually end up with a weasel error. As soon as I closed my app and stopped swapping items my connection was fine.