Aditya_S11 wrote:
Is this a problem that could be caused by internal damages by dropping it?
It could be...did you drop it?
The first thing I'd try would be to close all running apps, then force restart the device to be sure you don't have a runaway process or app:
Close running apps:
Double-tapping the Home button will bring up the running apps icons along with an app screenshot "card" above the icon. Tap-drag the app's -card- (NOT the icon) up and off the screen. Close off ALL apps here. Wait ~30 seconds, then:
Force Restart (won't affect settings/data/music/apps/etc)
1. Press and hold (& continue to hold) BOTH the Sleep/Wake button & the Home button.
2. Continue to hold BOTH (ignoring any other messages that may show) until you see the Apple logo on the screen.
3. Release BOTH buttons when you see the Apple logo and allow the device to boot normally.
You do realize that the devices do get quite warm when using them...even just "watching videos or surfing the web" can generated heat. A general rule regarding heat is if it's too hot to hold comfortably, it's too hot.
If you're at all uncertain, take it in to a Genius Bar for evaluation.