HOW TO REPAIR IT FROM HANG ?

What kind of hang? On Restart?

If it just hanged while you are texting, browsing and stuff, try restarting.

if its hanged try to discarge it fully and then charge it and retart
if there is charging problem first check your charging cable/charger
if they are allright,,,go to ervice centre there is problem with your charging ic

Maybe you need to update your phone software version ? Try that. Hope that helps.

Find your solution from the list,
Apple Iphone Smartphone
Codes:

• Unlock Code,
• Password,
• Puk Code,
• Lock Code,
• Other Codes.

Software & Hardware Problems

• Software Problems (Hang, Youtube etc.)
• Hardware Problems (Display, Charging etc.)

Find Your Solutions for other Apple Products:
Apple Iphone 3G
Apple iPod Touch Digital Media Player

Find your solution from the list,
Apple Iphone Smartphone
Codes:

• Unlock Code,
• Password,
• Puk Code,
• Lock Code,
• Other Codes.

Software & Hardware Problems

• Software Problems (Hang, Youtube etc.)
• Hardware Problems (Display, Charging etc.)

Find Solutions for Apple Products:
Apple Iphone 3G
Apple iPod Touch Digital Media Player

my ipod get hanged while playing song how can i solve this problem

If it is hanged up, then it might have a virus. It is better to reflash it an reinstall the firmware. Secon thing is it's battery need replacement.

restore it

I had the same problem > HARD RESET worked. Press and hold the TALK and END buttons, and also press the RESET button [at the bottom of the phone], all of this in the same time.
Then release the RESET button but continue to press the TALK and END buttons, and a message will appear asking you if you really want to reset everything.

Do you use wireless keyboard? If not, your keyboard wire might be loose maybe you should try to borrow other keyboard from your neighborhood and if not hang when you replace the keyboard, you have to buy a new one.