Personal Hotspot causing Iphone to crash

Hi Guys,
Using Iphone 4 with iOS 5.1.1 here
I've searched through the database as well as on google but couldn't find this issue anywhere else so I figured I'd post it here
There seems to be an isssue with my personal hotspot on iphone. In the past I could use either USB tethering or Wi-Fi sharing without any problem but recently I've noticed that whenever I turned on hot spot, and have other devices try to connect to it The connection would be established, but it seems like once the data starts transferring, Iphone would automatically shut itself down, or, rebooted itself rather.
The thing is I can still use USB tethering just fine. And this wi-fi hotspot crash problem never occurred to me before.
i tried restoring to factory, as well as network settings, none of which had worked.
Anyone got any idea?

Have you pre-arranged with your mobile carrier for you to use "tethering" with your iPhone?  Many mobile carriers block such tethering until you sign up for that service and pay an exta monthly fee.
Hope this helps

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