I bought this for my college age sun in October, no AppleCare+. About 2 weeks ago the said it wasn’t working correctly. I unpaired it with his phone and reset as new to my phone. On 3 occasions the screen becomes unresponsive. It still has power, i get stand credit and can hold the side button for Siri but the screen is blank. I can not get the screen to come on again till I put it on a charger. When I put it in the charger, it will restart and battery is more than half. Anyone have any idea what’s going on?