Iphone 3GS update to iOS4.3.3 - stucked at unlock screen

Hi,
I got a 1.5 year old iphone 3GS which I updated to iOS 4.3.3 last week. Everything was fine with the restore process, got all my data, apps and music back on the Phone.
However 1-2 days after the update the iPhone went into a endless loop when trying to type in your unlock code. Actually the screen jitters a little bit, no keys are accepted, you can see the "activity wheel" spinning in the background, the only way out is reset.
I am not finished testing all possibilities (i.e restore again without any new apps, remove SIM card, remove unlock code, stop all background apps..) but I am surprised to find such a severe bug where I cannot be sure about a SW or HW bug??
Anyone else with this error?
Cheers, Emilia

Found the culprit by myself. Out of some reason the database for old SMS messages got corrupted. I could not send any SMS and any message coming in crashed the phone
Another new backup restore resolved the issue.

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