iPhone 4S with iOS 5.1 on n mode wifi

just want share observations guys.
own iphone 4s. before upgrading ios 5.1 ios 5.0.1, wifi connectivity on 4s best on "pure n" network according own testing.

after upgrade, however, iphone 4s drops wifi , extremely slow (most noticeably when streaming videos using third party apps/ downloading apps app store) 4th generation airport extreme , 3rd party wireless access point @ home.

solution problem switching wireless mode b/g or pure g mode, ie avoiding n mode altogether.

of face same problem or me?

way, restoring/ resetting network settings/ resetting settings doesn't seem solve problem

 

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