Mac Pro disconnects from internet

I keep loosing my connection to the internet.  This disrupts incoming mail.  I have restarted my computer.  Reconnected manually to the internet.  I thought it was fixed but I was wrong.  Any thoughts?

2/15/12 11:17:19.000 AM kernel: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
2/15/12 11:17:27.000 AM kernel: AirPort: Link Up on en1 
2/15/12 11:17:27.000 AM kernel: AirPort: RSN handshake complete on en1 
2/15/12 11:17:27.848 AM airportd: _doAutoJoin: Already associated to “Myronmilo”. Bailing on auto-join. 
2/15/12 3:30:13.000 PM kernel: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving). 
2/15/12 3:41:11.062 PM defaults:  
The domain/default pair of (/Applications/Google Chrome.app/Contents/Info, KSBrandID) does not exist

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