I suffered terribly from the other FM radio app stopping, and losing audio. For me it was generally when system notifications sounded, and was a big enough pain for me to stop using it. Often the radio just would not work again until a hard power off. I think it was the chip being left high and dry by the app.

Just been using Qradio for about the last hour without interruption, and for me at least the notification issue I described above did not happen for me.