I finally switched to TuneIn and it gives me none of the problems that iHeart had with my windows phone regarding wife-cellular handshake, bluetooth on/off, etc. I have to hit the start button on TuneIn after the wifi handoff, but it does not require a restart or even reboot as iHeart did all too often.
I was actually going to switch to an Android phone because of my trouble w/ iHeart. Love that service but they never got the Windows app right (cust support was responsive but I think they gave up on development). I'll continue w/ iHeart on my desktop, but so glad to find a radio app that works on my Win phone, which is back to being perfectly useful.