Can I switch off the automatic volume-down for the 3.5 jack?

I use the headphone socket to plug my device into the car speakers and listen to podcasts while I'm driving. The only way this works is if the device's volume level is on full loudness. You can't hear the show through the car's speakers any other way. Occasionally, something will trigger something and the device will automatically go significantly quieter and you can only barely hear the show. The only way to get the sound audible again is to dismiss the on-screen dialog and turn the volume back up. I can't do that while I'm driving so until I can stop safely I have to put up with the show continuing to play in a barely understandable whisper and when I can pull over I have to rewind the show to where I was listening. If the show ended in that time I need to download it again. Is there please a way to turn off whatever is doing that?