Macbook Air 2013 model stopped connecting to the wireless network

My 2013 MacBook Air has suddenly stopped connecting to my network. It is often intermittent and will kick me off the network if anyone else is connected. I think it is something to do with my Linksys router and the new Apple Airport card.
Do I need to get a new router and if so do I need the Apple Wireless router?
Andrew

Work through the steps in http://support.apple.com/kb/TS1398 and see that brings it back.

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Dear users and support,
I have just bought my macbook air with lion os already installed, but I am unable to connect to hidden wireless network. Is there any trick to fix it? even though I am typing the name and password it's unable to login.
Please advice.
tks,

Back up all data before making any changes.
Step 1
Take all the applicable steps in this support article.
Step 2
If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 3
This step will erase all your settings in the Network preference pane. Make a note of them before you begin, and recreate them afterwards. It may be helpful to take screenshots of the preference pane.
Triple-click the line below on this page to select it:
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Services ▹ Reveal
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Go ▹ Go to Folder...
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http://support.apple.com/kb/HT1341?viewlocale=en_US
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http://www.macosxhints.com/article.php?story=20031215144430486
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https://discussions.apple.com/thread/3422041?tstart=0
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About NVRAM and PRAM
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Macbook Air 2013 model stopped connecting to the wireless network

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