[morzh]

Here's another theory:

On that station (and this is all my music) when tuned in I hear 60Hz (or it looks lie it) hum.
I think when mixed with music it actually makes that distortion. This is that choppiness I hear.
The hum comes through on every radio I got, and it is not there all the time, depends on the time of the day.
But on other radios it is just being a low hum and so when the music is there I cannot hear it, especially when the volume is medium and up.

On this radio and on the 20 this hum sounds more like a buzz and it does not mix well with the music. Not all other stations have it. But they do not play music. So I cannot check.