No, I haven't noticed, but will check this afternoon.
I have noticed that if I am playing music through USB, that when I shut the car off, it switches to whatever was the last non-USB source I had selected, and I get blasted out by the volume difference. Note, that I have selected a setting that allows the radio to continue to play for 20 minutes after the key is shut off, but apparently it won't play the USB source in that mode.
How many others have a big volume difference between USB and other music sources? USB comes in at about 1/2 the volume of the other sources, which is really annoying. I've tried adjusting the Aux Audio Offset (Menu button), but that has no effect. I am guessing that the Aux Audio Offset only affects whatever is plugged into the Aux Audio port, which is directly under the USB port in the glovebox.
Alvon Elrod, #18 White, no sunroof
1970 Fiat 124 spider