Chosen Solution

Setting the slide switch to the sleep setting causes the vibrator to run continuously. Has anyone else seen this issue, or have a solution?

It sounds more software. I would try the settings like you said, if that doesn’t take, do a force restart, if that doesn’t take, back it up, put it into dfu, restore. If all of that doesn’t take, then we go for surgery. As replacing this cable is the most complicated repair on any iPhone, we’ll try that last Here’s parts iPhone 6 Power Button Cable Here’s labor https://d3nevzfk7ii3be.cloudfront.net/ig… Also, I realize this sounds ridiculous, check and make sure there isn’t an S on the back, with a box around it. It makes a big difference. Practically all my customers don’t know this, and don’t understand why the repair cost is higher

Could be a faulty mute switch, i’d try disconnecting the old one and plugging in a new one (just lay it on top of the battery), remember to disconnect the battery before unplugging and components. Power on the phone and see if the fault clears.