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Just a few days ago, my router started acting up. We have several laptops and phones all connected fine, then I will suddenly lose internet access. The windows 7 networking icon is showing me connected but no internet access, however, I can't even connect to the router ip address over wifi. If I use a wired ethernet connection, then everything still works. If I power cycle the router, then everything will work for an hour or two before it drops the wifi connection again. When the wifi goes down, all computers can see the network, but none can connect to it. From windows 7, it just times out.

What could be causing this problem, and steps can I take to troubleshoot this kind of problem?

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Another factor: the router was working without issue for a couple months before it started acting up. –  Joe Jun 20 '13 at 5:13
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Check your DIR-636L firmware from the link and update to latest. After that there is something called WISH on your device. WISH is short for Wireless Intelligent Stream Handling, a technology developed to enhance your experience, when using a wireless network, by prioritizing the traffic of different applications. Find and configure it with using this link: How do I configure WISH on my DIR Series router to enhance my wireless network?

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I wouldn't expect wish to make it so I can't connect to the network at all? –  Joe Jun 20 '13 at 5:12
    
@Joe I think your problem will be solve from my answer: superuser.com/questions/450940/wifi-connection-not-working/… –  Mohammad Hassan Jun 20 '13 at 12:13
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