iHeartRadio App

I tried using the iHeart app yesterday.  I do have an account (I listen to it at work online).  I was listening to my local radio station (Magic 93 - 92.9 FM).  It would play for about 15 seconds and then pause.  I would have to hit the play button again to hear it.  Again, it would pause after about 15 seconds.  I tried another radio station (that is out of state) and had no problem with that.  Is this an issue with the radio station, iHeart or Comcast Xfinity?