Wobbly screen-- warranty exchange?(old question w/overheating issue also)

[cassith]

My screen is very wobbly and rattles when it is on vibrate. Will they do a warranty exchange or make me file insurance? I don't want to go in (since my phone is still technically functioning) and they void my warranty for the looseness of the screen and vibration. Not sure if they will try and say it's my fault. I have no experience with Verizon...

(old question)
I know there are certain things you can do to keep it cool. I never had a problem w/overheating until a couple weeks ago. Now everytime I plug my phone into the USB it gets very hot and I can't leave it on very long. I don't want to keep an icepack under it everytime I want to charge it or use it so, if it gets very hot, will my phone die or malfunction? I still have it under warranty so I'm wondering if this is covered in case it does die?