Won't connect to preferred network automatically

In the last week, my Macbook suddenly doesn't connect to my preferred network (top of the list) automatically. Rather I sometimes I have to turn airport on and off once or twice and it usually connects to another network first. Suggestions?

Seems to have been fixed in an update. I currently run Mountain Lion and had forgotten I ever had this issue.

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    Hi there,
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    I've always been automatically connected to my AE network when logging on to my account or waking up from sleep while logged on but that's no longer true anymore. I now have to select the network from the airport icon in the menu bar. I'm not prompted for my password. In Network Preferences, my network is specified to be joined by default.
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    This has been covered in the forums numerous times.

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    After installing the new security update 10.5.8 from today, my MacBook Pro does not automatically connect to my preferred networks (airport) anymore. They still exist and are running. So when manually connecting (typing in the network SSID and password) it works.
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    Hi Chris,
    you might find a cure here :
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