Wireless disconnects frecuently

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http://askubuntu.com – I do not know why, but my wireless get disconnected almost every 3 minutes. There I post a chuck of my syslog in http://paste.ubuntu.com/1384647/ . In this chunk you can see when WiFi is connected and then disconnected (see tail). If you know how to solve it, please reply me. This happens in all networks where I have tested. (HowTos)