On my iPhone 6 I thought the reason my charger was temperamental was due to it being a fake lightning cable off eBay. Whenever I moved the phone so that the cable tugged slightly it would disconnect and stop charging momentarily. On my 6s with original charger and lightning cable I am experiencing the same phenomenon! Why can't Apple make a decent cable? If they make it so short then of course it's going to tug whenever you try use the damn thing. I thought apple was all about user experience but it drives me mad they can't sort simple things like this.