Someone please help me with this!! My phone stopped doing this for a while, but these issues have returned. Additionally, when I plug my phone back into the aux cord, a playlist of all my songs in alphabetical order shows up for no reason. This is truly strange, and I would appreciate any...

My iPhone 5s used to pause my music when I unplugged my headphones or aux cord. Now it completely stops the song instead of pausing. Also, my iPhone now automatically changes the volume to 50% whenever I plug in headphones again. How can I fix these two very annoying issues?