If you've enabled TA (traffic announcements), you want the player to be listening to the radio for you when you're not. And you want it to be retuning the radio so that it can keep doing so. 2.0b13 did the former, but not the latter. ISTR the team saying that 2.00 final would fix this, and I guess that Lemmy does too.

Edit: and also, you want to be able to switch back to radio at any time and have good reception of the station you were last listening to.