Wireless connection is getting disconnected every n minutes

update your Adapter online
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set the transmitting power of the router(AP) to medium or low
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try using another channel or securing your wireless network if it isn't secured yet
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For me the solution has always been to fix the power saving default in windows. Here's what you do:
1. Go to Internet Connection in Control Panel
2. Right click on icon for your wireless connection and go to Properties
3. Go to Configure - Power Management
4. UNCLICK "Allow the computer to turn of this device..."
Hopefully the random signal drops will disappear... because the power is no longer shut down on your USB wireless device
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Do you have 2.4GHz cordless phones? Baby monitors? Electric cords near antenna? If so, you may want to unplug/move them to see if problem persists. Also, make sure router antenna is at least 6 inches away from any wall.

What wireless channel are you using?
1. Try channel 11, then 1, 2, etc until you find one that resolves the issue. The idea is to stay as far away as possible from saturated channels in your neighborhood.

2. You can download a program like netstumbler to discover wireless networks in range. This will list their channel and allow you to configure your router to a channel not used by your neighbors.
*This program will not pick up WLANs that do not broadcast their SSID.
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update the router firmware
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Source:
Dropped connection
http://forums.cnet.com/7723-7589_102-126523.html

Belkin Wireless-N USB Adapter cuts out intermittently
www.wirelessforums.org/network-troubleshooting/belkin-wireless-n-usb-adapter-cuts-out-intermittently-44626.html