 But once you reinstall everything and use it again, if it's still happening, I don't really have a good solution. I would say just wait for an update for the app because, again, there are many people using YouTube. I have not heard of a widespread heat issue with the YouTube app on the iPhone. But if you are using it a lot, yes, especially in the summer, it would cause your phone to heat up. The 88 battery percentage is a little concerning. That is a lot, but it depends on what you're doing on your phone.