Thunderbolt ethernet adapter

Hi,
Using the wired thunderbolt ethernet adapter my network works for about a minute after the adapter is plugged in then stops working with the cable showing as unplugged in network settings. The only way to reconnect is to pull the adapter and re-insert it.
As far as I can tell all software and firmware is up to date.
Is this likely to be a faulty adapter or am I missing some other settings?
thanks,
Andy

I haven't tried this yet but someone else posted a solution here--> http://store.apple.com/us/question/answers/product/MD463ZM/A?pqid=QX9TA99XFCKHD2 74UUDXXXFHKKDTXH22K9UT99TATKCDUTTY7

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Welcome to Apple Support Communities
If you purchased the computer before 2010, your computer hasn't got Thunderbolt, so you can't use it

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http://support.apple.com/kb/HT1379?viewlocale=en_US&locale=en_US

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http://rohanradio.com/blog/2012/02/27/fixing-thunderbolt-ethernet-on-the-macbook -pro/
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Haha I know, I know! I was willing to give Mac OS a go, and DID for a little bit but I need to run a fair few windows only software suites, and REALLY like the 2880x1800 retina display (something you can't get on a windows laptop!)
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There's no point quietly accepting niggling issues if someone out there can help!

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I have spent the last two weeks scanning every single forum and every response in regards to this very question above and none have worked.
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I see so many issues with the thunderbolt connection online so clearly something is a miss. I have VMWare fusion 5 installed if that helps also.
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Thanks

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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thnx alot.
ps: sorry for bad english

Here is a screen shot from VMware. This is accessible from the Settings -> Network Adapter -> Network Adapter Settings...
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From what you describe, this is normal (ie. correct) behaviour...
In a dark environment, you don't need the lighting to be as bright, because youre eyes are adjusted to the darkness, and there's less ambient light. In a lighter environment, you need more light from the keys and the screen to get the same effect.
The important thing isn't "how many bars of brightness is it set to" but "can I read the key caps and see the screen". If the answer to that question is "yes" than the automatic light adjustment is doing it's job - if it's too bright or too dim them just adjust it accordingly and then leave it on automatic.

Thunderbolt ethernet adapter

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