WiFi turns off after an inconistant amount of time until restart.

On my MacBook Pro. My wifi turns off at certain times. So to battle it when I feel its about to go I'll turn airport off and on again. I don't get it. It really happened after installing 10.5.7. Although I remember once long before that the airport turned off and went back after restart. Could have been with 10.5.3. I ran Apple Hardware test (not the through one just the normal one) and it said that my hardware was fine? Is everyone experiencing this on All 4,1 MacBook Pro 17" Models?

Here is something but I am not sure whether it is the right thing.
Jul 25 20:01:14 Jan-Kouts-MacBook-Pro kernel[0]: AirPort_Brcm43xx: Ethernet address 00:25:00:47:15:60
Jul 25 20:01:14 Jan-Kouts-MacBook-Pro kernel[0]: AirPort: Link Down on en1
Jul 25 20:01:16 Jan-Kouts-MacBook-Pro kernel[0]: AirPort: Link Up on en1
Jul 25 20:01:39 Jan-Kouts-MacBook-Pro com.apple.launchd[81] (com.apple.AirPortBaseStationAgent): Unknown key for boolean: EnableTransactions
Jul 25 20:01:40 Jan-Kouts-MacBook-Pro airportd[22]: Error: processsccallback() interfaces: 2\n<CFArray 0x10d370 [0xa03551a0]>{type = mutable-small, count = 2, values = (\n 0 : <CFString 0x101d80 [0xa03551a0]>{contents = "en1"}\n 1 : <CFString 0x102260 [0xa03551a0]>{contents = "en1"}\n)}
Jul 25 20:45:32 e178111037 kernel[0]: AirPort: No beacon for too long time
Jul 25 20:45:32 e178111037 kernel[0]: AirPort: Link Down on en1
Jul 25 20:51:02 Jan-Kouts-MacBook-Pro kernel[0]: AirPort: Link Up on en1

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I was assuming airport in this statement in your first post meant the TC or the Express.. but I now realise we are still in the mass confusion stage where apple calls everything wireless an airport. So what you mean is the airport internal card of the computer??
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Hi,
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Since such issue can be caused by driver bug, please also contact the manufacturer to see if they can provide more information about this issue.
http://social.technet.microsoft.com/Forums/windows/en-US/11d2cc27-cee8-41e1-865a-f5f7098e1d26/windows-8-wifi-off-problem?forum=w8itpronetworking
For further troubleshooting plan, please upload the event log here for further research.
Kate Li
TechNet Community Support

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WiFi turns off after an inconistant amount of time until restart.

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