I've not only had it do a 'soft reset', but the majority of the time, upon exit, it invariably bricks my phone. I couldn't tell you why, but my guess is it's because Pandora will work on this phone,(not that well I might add) but it isn't completely compatible with it.
i still have this problem i think. its very random though. oh well, i still like the app. doesnt bother me too bad cause its only a few seconds of delay.