Some phones have a app that controls different type of connections. Something like smart connect or smart audio. See if you have anything like that on your phone.

Whenever I have headphones plugged in, Mediamonkey randomly starts playing music. Sometimes it starts one song and then starts another song when I am moving the phone with the headphones plugged in.

I do not have Resume play on connection checked. I am playing a game and have to constantly stop media monkey as I am playing. This has something to do with the headphone jack as I opened Mediamonkey and then starting turning the headphone plug in the headphone jack slightly and the music started/stopped randomly.

Any way to stop this from happening? It's extremely annoying.