IPad Wi-Fi DHCP failure

My iPad's WiFi connection has just stopped working since a couple of days ago. It can connect to WiFi access point. However, it fails to correctly obtain its IP address and other related information such as mask, DNS, and others. So, it shows full bars on the top of screen, but cannot connect to Internet at all. I had used the Internet connection and hasn't changed any network related option at all. It just stopped working. I've even tried to connect to several different wireless access points, but its symptom is same. So, I do not think that it's a specific wireless router problem.
I've reset its network setting; furthermore, I've done with "Restore". Even in the original factory setting, it shows me the same symptom. Is it a hardware problem?

JimHdk wrote:
Those other discussions aren't really relevant and millions of users are using 3.2.2 without WiFi problems. (3.2.2 didn't contain any WiFi changes vs 3.2.1)
It's not true. It IS RELEVANT. A few guys actually complained the same problem as mine. They had used their iPad with a WiFi connection without any problem for a while, but suddenly got a problem. Furthermore, "millions of users are using 3.2.2 without WiFi problems." doesn't necessarily mean that the OS doesn't has any bug related to WiFi in it. It might not be specific to 3.2.2 only, though. If millions of users using 3.2.2 had a problem with WiFi, this bug would be pretty easy one to catch. Apple must already fix it.
In the linked forum, one of guys said that changing brightness setting is related to some WiFi connection problems. Last night, I tried to change the setting several times; then, the WiFi connection in my iPad suddenly worked. However, when I reset the iPad to make it sure, it didn't work again. I desperately tried lots of different trials, so I couldn't repeat what I did with the brightness setting. So, now it still doesn't work.
I cannot rule out the possibility of hardware fault in my case. However, based on my little experiment which I mentioned, it seems to be more like some bug in the OS.
Message was edited by: Youngsang

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