i looked into this a little bit more and the driver is still fairly new and 
uses a firmware blob from realtek. 
updating the kernel won't help much, as the firmware is distributed within 
ubuntu.
you could download the driver from realtek (there is a new version from 
2010/10/25) and compile it yourself, there are instructions on how to do it on 
Fedora here: 
http://www.linwik.com/wiki/using+the+realtek+8172+and+8192se+wireless+controller+with+fedora+12
let me know if you need help with it

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https://bugs.launchpad.net/bugs/674680

Title:
  Network manager drops, then re-establishes wifi connection every 2 minutes

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