i also found this problem with hp pavillion 14-e005tx network card ralink 
rt3290 ubuntu 12.04, 13.04
the problem occurs only if i used wireless in fix ip (in my work place) , and 
not found when set it to dhcp (in my home), i also update kernel to 3.9.0 , 
3.9.9 but i still got this issue

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https://bugs.launchpad.net/bugs/1115998

Title:
  Wireless cutting out after a few min of use in 13.04

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