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Re:PiBakery – a blocks based, easy to use setup tool for Ras... by Knacker_Hughes on Wednesday September 07, 2016 @10:17AM (#12443557)
I think the Edimax Nano WiFi dongle driver goes to sleep after a while under the default settings.

https://www.raspberrypi.org/forums/viewtopic.php?t=61665

Re:PiBakery – a blocks based, easy to use setup tool for Ras... by rgoodwintx on Wednesday September 07, 2016 @10:40AM (#12443756)
Bingo, that was it!