I think, I solved this problem, at least for now... (iPhone 6s) I think it's actually some kind of feature regarding the volume limit function. (It's not a new feature, just a little weird) I've been facing these issues recently too: When I press the vol. UP or DOWN buttons on my earpods (or another headphone) and when a new song comes in playlist, it wakes up the phone's display. But I noticed, that it only happens when the volume level is above a certain value. (Now, I updated to ios 14.1, high volume level is marked with yellow color, I don't remember how it was in previous versions). So the one thing you should try is Settings -> Music -> Volume Limit and turn it ON, and finally the main point, turn on EU Volume Limit. It removes the yellow part from the volume meter when you changing volume level. So basically, this whole display awakening thing is just supposed to be a warning, that you listening music too loud... Btw how could your phone tell you that music is too loud, if you can plug almost anything into that headphone jack..