Wifi Problems Still

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well. after 18 months, 1 laptop replacement , weeks @ apple. still having problems wifi. every other device/computer works isn't access point. fails on every access point try , have tried many. wifi drops , laptop cannot see access points connect unless shut lid , open again. sleep signal seems reset wifi , allow connect again. if turn off wifi menu , switch on again won't connect again. either has restart or sleep reset connection. following snapshot of messages @ time fails.

01/08/2011 15:30:49 kernel airport: link down on en1. reason 4 (disassociated due inactivity).
01/08/2011 15:30:49 kernel vmnet: bridge-en1: interface en going down
01/08/2011 15:30:50 configd[13] network configuration changed.
01/08/2011 15:30:50 vmnet-bridge[119] dynamic store changed
01/08/2011 15:30:50 vmnet-bridge[119] failed read scproperties key: state:/network/global/ipv4
01/08/2011 15:30:50 vmnet-bridge[119] stopping bridge for: en1
01/08/2011 15:30:50 apsd-ft[245] <apscourier: 0x101809a80>: stream error occurred <apstcpstream: 0x101a21e30>: error domain=nsposixerrordomain code=57 userinfo=0x101a22a80 "the operation couldn’t completed. socket not connected"
01/08/2011 15:30:50 apsd-ft[245] <apscourier: 0x101809a80>: stream error occurred <apstcpstream: 0x10180f320>: error domain=kcferrordomaincfnetwork code=2 userinfo=0x100637970 "the operation couldn’t completed. (kcferrordomaincfnetwork error 2.)"
01/08/2011 15:30:51 kernel vmnet: vmnetdisconnect called port 0x18a95c00
01/08/2011 15:30:51 kernel vmnet: invalidating peer info hub: 0, port: 0
01/08/2011 15:30:51 kernel vmnet: bridge-en1: filter detached
01/08/2011 15:30:51 kernel vmnet: bridge-en1: down
01/08/2011 15:30:51 kernel vmnet: bridge-en1: detached
01/08/2011 15:30:51 kernel vmnet: freeing hub @ 0x1cd4a000.
01/08/2011 15:30:56 firewall[98] krb5kdc listening :::88 proto=6
01/08/2011 15:30:56 firewall[98] krb5kdc listening 0.0.0.0:88 proto=6

can occur 10 times in 10 minutes or 2 in 2 days. if use 3g dongle or ethernet cable no probs.

cleared , regenerated system caches using tinkertool system , seems have helped. affecting work. there increased debug logging can switch on kernel or network?
ideas fix? have tried changing wep/wpa/wpa etc. , channels , speeds. nothing helps.
 



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