Wireless Connection Drops And Picks Up Frequently

Sep 8, 2012

I am trying to track down a problem I am having with one laptop. Other wireless devices on the network are not showing the same problem. Connecting to the router by ethernet resolves the problem.Over a 120 second period, the wireless connection drops and reconnects several times. Each time it drops it almost immediately picks up and re-connects. The "down time" is usually between 5 and 20 seconds.I have updated the driver for the wireless card (it was out of date) but this did not resolve.

Reading posts here - I see you typically need to see a WiFi inspector screen shot - which I have attached. You can see a couple of "drops" on the graph.

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[code]...

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I am using DHCP ISP , but the connection only last for 20 mins exactly and then it will automatically disconnected. Every time I reset the WAN port ,
 
service back to normal for another 20 mins ><
 
The are no log or any error message when connection timeout. the status of the WAN port is normal "Up Up".
 
I have tried this config on another ISP and everything work just fine ! 
 
Fiber converter -------> Cisco 1812 (FastEthernet1) --------->LAN
 
Router#sh runBuilding configuration...
Current configuration : 3205 bytes!
version 12.4service tcp-keepalives-inservice tcp-keepalives-outservice timestamps

[Code].....

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Fiber connector -------> Cisco 1812 (FastEthernet1) --------->LAN

Router#sh run
Building configuration...Current configuration : 3205 bytes
!
version 12.4
service tcp-keepalives-in
service tcp-keepalives-out

[code]....

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