I rarely see this issue unless it's hardware or the router. I read you've done a lot of software angle stuff but tell more and do a few quick tests for malware.
Tell me the result of RKILL as noted by Grif at link to follow.
Bob
http://forums.cnet.com/7726-6132_102-5098912.html?tag=posts;msg5099421
My network cards drop the connection and are listed as "unplugged" everytime I game online, regardless of the game. I have 2 internal Realtek PCI GBE family controllers on an ABIT IP35Pro mobo. There is no set instance of why/when this happens only that it is completely random and I get the usual Event ID's in the system log after it happens:
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The TCP/IP NetBIOS Helper service was successfully sent a stop control.
The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)]
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The Computer Browser service was successfully sent a stop control.
The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)]
There are no other events, Application or Security that happen right before these events other than MS Application experience service entered the stopped state in system log. It could happen every few hours during the day to every 5-10 minutes after midnight( this is what is very weird since it did not do this prior to midnight this many times ). I sit behind a uverse router with it passing through a gateway from 2 powerline adapters. I have no problems downloading torrents, watching movies or anything l else strenous on the network, but gaming. The only fix I have found is to disable the card and reenable everytime.
I tried reseaching this issue online with no luck on this event ID ( 7036, 7042 ) and no one seems to have an answer to fix this. I originally thought it was a Windows 7 64 bit issue, but I have tried the fixes below with no luck.
1) Disabled Computer Browser service
2) Disabled TCP/Ip Netbios Service
3) Updated Realtek drivers
4) Rolled back realtek drivers
5) Changed IP address
6) Reset TCP/IP Stack
7) Completely blew out Windows 7 Home and installed a fresh Windows 7 Ultimate I had
Disabled windows 7 from shutting these cards off
9) changed power management to never sleep the system
I am at a loss now and I am reaching out for some help here on this. Any network gurus out there want to give a fellow techy a hand here?
Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic