Last night I fell asleep while playing a youtube downloaded video on my Samsung A8 (older version). While sleeping I accidentally pushed the phone under the pillow. When I woke up after about six hours, the phone was super hot and making a weird whirring sound (not too sure about the sound since I'm half asleep). I quickly turned off the phone. After about 3 hours I turn it back on again. While turning it on, I have notice it getting hot which has never happened before. So I turned it off again. I am worried that I have overheated my phone and may have internally damaged it. How do I fix it if that happens.