Not sure what is going on with my Galaxy S6, but this has been an on and off issue with it since I got it. Once and a while when I plug in my earbuds the phone goes totally wonky and starts opening apps (usually starting with Google Search Voice Command with the "Listening" prompt). Then the volume will start to either go all the way up or all the way down, which can be annoying, borderline dangerous, when you're at the gym running on the treadmill and all of a sudden the volume goes all the way up. I tried a set of bluetooth buds to see if it was an issue with the headphone jack and it happened with them as well. Should I call a priest to have an exorcism performed on my phone?