WRT400N Frequent disconnects and now Connection Not even Viewable

We purchased this router looking for the speed and ability to have 2.4 and 5gh at the same time. Have 5 laptops connected but only 2-3 used at a time. 2 dell, 1 Toshiba and 1 vaio. Once I installed it took an hour to get the internet to be recognized and wireless to work. SInce then every time I put the computer on sleep or shut down the internet disconnects. The reconnect was usually fast , maybe 5-ten seconds. However yesterday we started experiencing the internet connection dropping all together and the router/connection not even being recognized on the wireless option in the Network and Sharing section of Windows 7. I have never seen where you can't even click on the connection to diagnose etc. As of this morning there was still no connectivity. I have rebooted the DSL (Brighthouse Cable) modem, rebooted and rest the router numerous times. The internet might show back up for a few seconds, and then drop again. I'm two seconds away from returning this puppy as it's only been a few days since we got it. Any insight or help would be greatly appreciated.
Solved!
Go to Solution.

Login to the setup page of your Router and below change the MTU size to 1350 and click on save settings, then under the wireless tab change the wireless channel to 1 or 11 and click on save settings. Now again try to connect to your wireless network.

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