iTunes Radio stops sometimes. Also I have to Quit/Open sometimes.

I love iTR but there's one thing that bugs me. It stops every so often. Then I have to click the station again.

I'm using the Bose SoundTouch system but it's not the system because it was happening just with the Mac too.

Also if I leave iTunes Radio open without playing anything for a while I actually have to Quit and Open iTunes again.

Is it Apple? ISP?