Known issue. I -think- it has to do with the WiFi drivers having problem waking up after going to sleep (which the WiFi Sleep seeing has it do by default whenever the screen powers down in sleep mode, even if it's charging). Does this only happen to you when it's charging, or whenever? I only saw it when it was plugged in, and either turning off WiFi or going into the Advanced area of the WiFi settings to set it to 'always stay on while plugged in' under Sleep Policy seems to have fixed it.
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