I have an ipod touch 4g 32 gb. after a week of use, i noticed that sometimes, after i unlock , the homescreen hangs for about 3-6 seconds.

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yes so this hanging issue is not all the time. it happens like almost half the times i unlock.
i tried restoring. initially it was ok. then i downloadded an app from the appstore. after downloading i unlocked my ipod and it hangs.
for sure it will hang at this time.
then it continues to hang
it is not jailbroken
and its not only the homescreen. its just the whole device. during this hanging time no button will work. the touch interface does not work. nothing. after 5 seconds....everything is back to normal ... it is very very annoying
plsss help!!!
i tried
1) reset (with all apps closed and wifi off)
3)restore (also dfu restore)
im currently on ios 5.1.1.
what should i doo???????
pleeeeeaasssseeee help!
Have you tried the Basic Troubleshooting Steps...
Restart... Reset... Restore from Backup...  Restore as New...
Restart / Reset
Backing up, Updating and Restoring
If you try all these Steps and you still have issues... Then a Visit to an Apple Store or AASP (Authorized Apple Service Provider) is the Next Step... Be sure to make an appointment first...
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