According to WifiSyslog the card disassociated 101 times, each time for
reason #8.

    May 28 16:31:42 uma-desktop kernel: [32141.841195] wlan0:
disassociated from 00:0c:46:f6:47:30 (Reason: 8)

Reason codes (from
http://lists.shmoo.com/pipermail/hostap/2006-April/013218.html)

    0 Reserved
    1 Unspecified reason
    2 Previous authentication no longer valid
    3 Deauthenticated because sending station is leaving (or has left) IBSS or 
ESS
    4 Disassociated due to inactivity
    5 Disassociated because AP is unable to handle all currently associated 
stations
    6 Class 2 frame received from nonauthenticated station
    7 Class 3 frame received from nonassociated station
    8 Disassociated because sending station is leaving (or has left) BSS
    9 Station requesting (re)association is not authenticated with responding 
station 

Perhaps you have a loose antenna cable?

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https://bugs.launchpad.net/bugs/1005389

Title:
  Wireless Network Connection Randomly Dropped

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