A lcd screen crack on my Droid Razr Maxx?

Well… I was in Biology class playing on my phone (DROID RAZR MAXX), and it was working flawlessly. I put it in my pocket and walk to my History class, and pull it out, and my screen won't turn on. All I get is a green blob of light in the bottom corner. So I'm like what the heck, and show my friend. She said the same exact thing happened to her iPhone, and I noticed that my lcd screen was cracked. HOW COULD THIS HAVE HAPPENED? The only thing I can think of that is viable is overheating, as my phone does sometimes get pretty hot, but I didn't know a screen could crack from it. Well, it cost my parents $140 to fix, so they told me to either switch to a basic phone until my contract ends, or continue using the droid, but if anything else happens, I'm paying. I think this is totally fair, but I just wanna know if anyone has had something similar happen? Especially with a Droid? I wanna continue using the Droid, because I'm pretty good at protecting it, but overheating is just something I can't really control… Well at least I think (Can I?), and being a teenager, $140 isn't exactly something I just pull out of my wallet without serious thought. So basically:
Has anyone else had this happen? AND
How can I prevent my phone from overheating?

Get new screen

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