The one constant issue I have been plagued with since day one is the CR-48 Chrome OS Laptop has been the WiFi connectivity when it resumes from sleep mode. More often than not after the computer resumes, the WiFi shows every indication of connectivity (including an IP address) but without actual connectivity. A simple disabling and re-enabling of the WiFi and I'm off and running again. I have tried switching out my wireless router as well as changing different security settings, but nothing so far as seemed to resolve the issue 100%. I have updating the "Chrome Ninja's" on my findings a couple of times. "Ninja" seems to be an excellent name for these evasive little guys!