Wifi shuts down after few minutes

When I turn on my computer the wifi connects to the network without a problem.  After 5-10 mins it stops working.  I still have 5 bars showing but no network or internet connection.  If I check preferences it says wifi is off and it won't show any available networks.
I tried using an external antenna but  ha an identical result.
I did upgrade t maverick but can,t tie the problem to the so change since it ran ok for about a week after the upgrade.
Does anyone have any thoughts?  Are there diagnostics that might pinpoint the problem.
Many thanks
Andrew

Download the free application iStumbler Beta (don't worry it will work in 10.9) to search wireless network around you and make sure your network is not on the same channel. That will help to midigate wireless crosstalk interference.
Amother hint I have used all these years is built-in. Just go to System preferences->Network pane anf at the top of the Network pane is 'Location'. Use that toggle bar to 'Edit Locations' and box will pop-up and click the + sign to add a custom named Location (like Home, School, work , etc) and don't forget to save all the way out to the main Network panel and there click the 'Apply' button to save the whole new network setup.  Rejoin your wireless network and see if that helps.

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