I've noticed WiFi has a habit of crashing and not loading if it tries to wake up from sleep mode. The Airplane toggle turning WiFi on and off does not cause any problems, but turning it on with the Home screen widget or Settings will cause the WiFi app to crash. It also seems to have kept my Kobo crashing too - by setting the sleep policy to 'Nver Sleep while Plugged In' and toggling airplane mode on when I'm away from a power cord and not actively using WiFi, I've had no lockup issues.
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