Iphone 3gs freezes and reboots itself every now and then

Hi, I have an iPhone 3GS with latest firmware 5.0.1 and sometimes it just freezes and reboots itself. I tried to restore it as new, from backup, I upgraded firmwares but still every now and then it just reboots itself. Often when I start the phone in the morning it reboots several times in a row. Are the latest firmwares buggy or what? Please help!

I found solution on this forum.  He said the problem solved by reset all setting -> as new phone.  (Don't worry, data is preserved).  This works for me so far.. keep my finger cross.

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