I also do not sleep WiFi and get occasional - like, one time in ten - when it will not connect to my home WiFi when I come back from being away. Once it is connected, even after sleep, it's always remained connected since I turned off sleeping WiFi. Usually I go into settings, Wireless Controls, WiFi settings, I'll see that my router has some sort of error message, I click to reconnect and I'm fine.
The only thing I can think of is do you have a neighbor who may be using the same channel as you are using?
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