Occasionally while I work, without any special provocation, I lose connectivity via Wi-Fi. Other devices connected to the same wifi network have no interruption, and the problem gets resolved once I reboot, so it's definitely a local problem.
- The Wi-Fi symbol in the menu indicates that I'm still connected, but apps can't actually connect neither to the Internet nor to other devices in the LAN.
- I can't connect to an alternate Wi-Fi network (e.g. Wi-Fi tethering via iPhone).
- I can connect to the Internet via iPhone USB tethering but this seems to only work some of the time.
- Only a reboot solves the problem but a regular restart gets stuck on a grey screen with rotating wheel (after all applications have closed) and I have to do a hard reset.
I'm on a MacBook Air mid '11 running 10.8.1.
How should I go about troubleshooting this? It used to happen very rarely but now is becoming more frequent (approaching once every 2-3 days on average).