MacBook Air 2010 network speed drop sharply after download starts

My MBA 2010 started having network issue a few month ago. The symptom is:
1. Sometime, the network speed (both in and out) drops to 0B/sec suddenly and all connection died, then comes back after a few sec. 
2. When downloading large files, the initial download speed was great, 2MB/s, but sharply dropped to 20KB/s after a few sec. And never increase.
I have another MacBook Pro on the same home network. Never had such issues with it. I also tried to download the same file from both machines at the same time or one after another. No matter which way, my MBP can consistently have 2MB/s speed, but my MBA only had 20K/s.
I had this issue with MBA when it was running snow leopard. And I thought it may deal with OS. So just upgraded to Mountain Lion (clean install). But still the same issue.
But when speedtesting with www.speedtest.net, MBA still works pretty good, 18mbps download, 4mbps upload. This really confuses me. I begin to suspect if my airport adapter is broken or getting flaky. Any help or suggestion will be appreciated.

Ok, when I take the MacBook Air into the room with the Airport Express the Internet Connection works well and the Airport Utility shows the Phy Connection as 802.11 a / n as opposed to 802.11 b / g / n
Does this tell me anything about why when connected to the Network via the Airport Express that I am having trouble connecting to almost any URL?  Sometimes it connects but very slowly.  When I do get through to the Speedtest things look Ok but with some serious valleys in the graphic.

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    Download EtreCheck from http://etresoft.com/etrecheck
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        MacBook Air - model: MacBookAir3,2
        1 2.13 GHz Intel Core 2 Duo CPU: 2-core
        4 GB RAM Not upgradeable
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