HT3867 my wifi icon show on off buttan show but not in use

my wifi icon show on off buttan show but not in use

Setting the router preamble to long does not work for me. I have tried everything.
I am connected to WiFi, according to the icon in the corner, but it just stops working at random times for all applications. The only way I can get the WiFi working again (temp fix) is to flick airplane mode on and off. Then it will work for a while, and then mysteriously stop working again, even though it says I am connected etc.
I have n 1st gen ipod touch, and two 3G phones here that can connect and stay connected with absolutely no problems, so it is definitely something with the 3GS.
I think I am going to have to try returning this iphone to Apple and getting a replacement, as I have tried everything to get it to work properly.
Not to mention the compass is VERY badly off with this iphone. But that is not as big a deal as WiFi refusing to work.
It is too bad because I get great battery life with this iphone... better than my 3G... and I am worried about returning this one and getting a replacement with poor battery life that I read so many other people seem to have.

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