I use my Radio to wake up. I can notice this very often :
I have choosen a radio stream to wake up, and the alarm lasts one hour. But after the hour, the radio stay on, with no sound. On the screen I can see the last radio I have listened to (the one for the alarm). 
When I come back home, if i want to listen anoteher radio, the screen remains with previous radio. I have to power cycle in order to have a godd display.