My iphone setting freezes everytime i use personal hotspots

I don't know what went wrong with my iphone
Recently my laptop uses my iphone as a router to connect to internet
and everything works great.
I usually left personal hotspot on untill the next morning, that means i don't turn it off when I am sleeping
and the next day on my laptop, the bottom right shows the internet isn't working.
so i would go back to my iphone trying to turn it off and restart personal hotspot again.
here comes the problem, everytime the internet isn't working, and i try to reopen it
my "Settings" always freezes and I can't change any settings
I can still using my iphone to play games, or any other applications, but not "settings"
what could possibly go wrong?
Does anyone have the same problem?
By the one I have updated to the latest version iOS 4.3.3

Yea.. Same problem here. And this *only* happens when the hotspot is suddenly not working (which is also another different problem, why does this happens so often anyway). Even the blue status bar won't dissapear even though i've turned the personal hotspot off.
Everytime this happens i usually restart my iphone. But here comes another problem. i always have to do a force restart (holding power button + home button). Coz the iphone will also freeze (the shutdown process takes forever) if i attempted to turn it off under this condition.
Btw, if i stop personal hotspot during an active connection, this problem doesn't occur.
I'm using iphone 4 and just upgraded to ios 4.3.5

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