My experience with WunderRadio has been the complete opposite of this. I was in DC the last two days and spent a ton of time listening to Boston sports radio (WEEI) and talk (WTKK), without dropping the signal even once. Most of the time I was listening over wifi, but I had a couple of 30 minutes+ walks without any hanging or dropping.
I can stream very well over WIFI with almost no problems. It's when I'm on EDGE, I have the most problems. I know it seems pretty obvious, but I've looked at my signal strength on EDGE when these drops occur, and I mostly have full bars. I seem to also lose it a lot when switching from WIFI to EDGE.