Error: playback failed message deletes my podcasts!

I am getting tired of this. I have an iPhone 4S, updated to the most recent software. Every so often when I open the podcasts app, it will randomly give me an "Error: Playback Failed" message and delete nearly all of my downloaded podcasts. This is especially aggravating when it deletes podcast episodes that are only available for a limited time (ex. This American Life). This has been happening for months now. WHY HASN'T SOMEONE AT APPLE FIXED THIS ISSUE?