I couldn't find this topic specifically addressed.
I paired a bt headset for the first time today (jawbone prime). Running pandora and email that's it.

Pandora began stuttering and then the multi card icon showed up. I have never seen this before (requesting that I close cards).

I couldn't close anything and the pre completely locked up. Had to reset and the whole sequence repeated. This time the pre just reset on its own.

Anyone experienced lockouts like this? Specifically with bluetooth?

On a related note, if I am not using bt but I have it on in the pre settings, what are folks' experience in terms of added battery drain?