My phone has been heating up lately more than ever and I don't know what to do.Is this a software issue or a hardware issue or a user issue?

The top widget tells me the upcoming events, although I've never actually made it, but it's something about school. The first time i saw this was when we were about to catch a 12o'clock bus and it legit said 'bus at 12'. This is a cool feature but i ...

Couldn't post this but look 

Graceful orange sunset picture Sunset shot on the note 10 lite