Network issue on iPhone 4S

hi guys.

i'm having unjailbroken iphone 4s, running pre-installed ios version --> 5.0.1. i'm having problems network.

when try use network (3g or wi-fi), nothing seems working. safari/twitter/email/streaming etc. says i'm connected, doesnt work @ all.

after reset iphone (dfu mode), works fine again.

problem seems occuring often, suddenly. @ least once day.

help, please.

 

you reset each time? have tried rebooting it?

or maybe full set new?

 

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