"Jumping" Internet on my Macbook Air

Hi All,
I'm having trouble with the wifi on my Macbook Air. The internet keeps diconnecting and reconnecting, although the Airport signal continues full. I know it's disconnected because pages stop loading, emails don't work and any active download also stops.
My wife's macbook pro, the ipad and iphones work perfectly using the same router.
It's a fairly new MBA, bought in Jan2013, has all the software updated and I use Google Chrome as browser. I thought it could have a relation with the Avast anti-virus software and uninstalled, but the problem persists.
Its becomig impossible to use the internet on it, as it disconnects  and reconnects after 1 or 2 minutes, disconnecting again after about a minute or so.
Any clue? 
Thanks

Boot into Recovery mode. From the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. While in Recovery, you'll have no access to your saved bookmarks or passwords, so make a note of those before you begin, if they're needed for the test.
Test. If you have the same problem in Recovery mode, make a "Genius" appointment at an Apple Store.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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