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I apologize for the issue you have.
You may want to use WPA(2)-AES for the encryption. Make sure the router uses this setting if possible and not shared like TKIP+AES. We also recommend other settings for 802.11n connectivity:
Data rate will not exceed 54 Mbps when WEP or TKIP encryption is configured
How do I improve my 802.11n wireless performance?
What are the recommended settings for 802.11n connectivity?
You may also try restarting the network devices (modem and/or router). A firmware update for the router may help.
I appreciate the help, but it's not my router settings. I'm a network technician for Comcast, and have a Cisco EA6500 router using the 5Ghz band set to WPA2-AES. The situation isn't more ideal.
Here are the router settings:
This issue has persisted through an EA4500, and an EA6500 router. It is always the drivers. Once a new driver is available, it comes with it's own issues. It did not lose connectivity with older drivers. I simply asked where are the older drivers.
Perhaps the drivers posted on this article may help you. Just check if the download applies to your wireless adapter model at the end of the respective page: