Iphone 4 running 4.3.5 wifi very unstable/will not connect to network

Hi all iPhone users. Im new to this so please bear with me. I have an iPhone 4 (had for about 1 month or so). I have recently updated to the new 4.3.5 software. Sice then, my wifi seems to be very very unstable. Im only about 10ft from my router and when I go to connect, I get an error saying 'unable to join network'. I previously had an iphone 3gs and that connected fine further away.
When my iphone 4 does connect, the connection lasts about 10-15 secs and then it will not load any web pages although it shows its connected. I have tried all methods on previous threads but nothing seems to work. Ive also tried retting my router and changing the wifi channel to make the signal stronger but nothing seems to work.
Ive seem some threads where people have 'put them in the freezer' but im not willing to do that as the phone is only a month old. Ive tried the network reset, the hard reset, re-installing itunes and trying the update again but it nothing seems to work.
Any help or advise would be much appreciated.
Thanks

Hi folks,
SOLVED
iPhone 4 wasn't having any joy (and neither was my new 4s).
Tried turning OFF the security on the router, connecting the iPhones (yep, they connected OK) then turning on the security (WPA2-PSK [AES]) and both iPhones still connected.
So, it looks like this is the way to solve a non-connecting iPhone 4/4s with a Netgear WiFi router.
Hope this helps others with the same problem.
Regards
RB

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