I have recently made some changes to my system configuration that mean that I am using Live Radio to listen to the news instead of another app. Shortly after making the change I started noticing an intermittent crackling sound coming out of speakers in some zones after I stopped playing Live Radio, but not every time so the problem is difficult to reproduce. I can see the LED lamp on the relevant amp periodically flickering when this happens.
The station I am listening to is KCRW. I have not tested this with other stations to see if the same thing happens, but I am interested in learning whether there may be a reason that Live Radio could still be sending an intermittent signal after I stop listening to it.