My work vehicle has quality 380w infotainment system, other week modulation was full , nice and loud breaking through all that electrical noise, listening level was eight, two days later would have to up volume of radio to ten , for same listening loudness , with more noise overtaking the music.
Sometimes audio quality and volume changed between previous DJ show's and occasionally between some songs, as well as music cutting out for a few seconds at a time .
So far today it's all been good , with some excellent show's 👍