How can i fix intermittent wifi connection on imac 21"?

What I have is a mid-2011 iMac 21" entry-level computer. I was able to run wirelessly for about a year with no issues but lately my wifi connection intermittently drops every 10 minutes and it becomes very frustrating. My brother who is also using the exact same model connects to the same belkin router just fine. My iPhone 4S, my iPad, my brother's iPhone5 and the other computers in the house works just fine as well. I install all updates recommended. I would like to know if there is a workaround to get this issue fixed. Thank you.

Hello, dee.tercias.
Sometimes a simple power cycle of the router can correct the issue that you are experiencing. However, the issue could be a little more complex. Wi-Fi routers need adjustments to settings periodically for optimized performance with the constant progression of wireless device technology. Below, I have included two articles. The first article will cover basic Wi-Fi troubleshooting. The second article covers the recommended settings for current Wi-Fi access points.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/ht4199
Cheers,
Jason H.

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