Wifi sleeps, even with Lock

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There are numerous bugs on the Android bug tracker to do with wifi sleep/power saving mode and even apps available that attempt to rectify this. So it is quite likely that you are not doing anything wrong.

http://code.google.com/p/android/issues/detail?id=9781
http://code.google.com/p/android/issues/detail?id=1698

Also check out wififixer which is an open source project which may help you with code to keep the connection alive

http://wififixer.wordpress.com/

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