First place to check is the mini plug, they like to be a problem. I find that the best thing to try is making and unmaking the connection many times. This can clear a film or allow the contact inside to re-engage the plug. Then if that helps then hit it with some air or better yet apply some contact enhancer to the plug and reinsert it. I like Caig Gold pricey but worth it and just like thermal paste a little goes a long way.....less is more !