Every once in a while, the green light on my Magsafe adapter will turn off, but the computer will indicate that it's still running off of AC power. If I unplug the adapter from the computer and then plug it back in, it'll immediately light up again. Is this normal?
Here is Apple's troubleshooting documentation: Apple Portables: Troubleshooting MagSafe adapters
I have a late-2011 MacBook Air, and I have never experienced this issue.