Intermittently unresponsive keyboard and trackpad on Macbook Air Especially since the 10.8.3 update, I've been experiencing occasional freezes of my 2012 Macbook Air's trackpad and keyboard. The trackpad will be completely unresponsive, and usually only a few keystrokes will get through. Other people have complained that similar things happen after resuming from sleep, or that it takes a reboot to fix, but this happens randomly (it'll be working perfectly fine and then become unresponsive, then be fine 10 seconds later).

I have no external USB devices connected, and nothing shows up in the system log at the relevant times. In addition, as has been suggested by others online, I've disabled the Android File Transfer helper process which apparently has caused similar issues for others.

It's still under warranty -- should I take this to the Apple Store, or perhaps try reinstalling the OS first? Will that be their first line of attack anyway, or do you think they'll be able to diagnose a hardware problem and fix/replace it?
I would create a new user and see if the behavior happens under a new account, so you can isolate whether this is System Wide or just related to your own account. Check your Launch Items in system preferences and remove everything just to test. 

How much free space do you have? For what is worth, I'm using a MBA 11' mid 2011 and I have the same behavior sometimes when Arq2 starts and I have IntelliJ + Xcode running. Like the CPU is under a lot of "pressure" and I totally experience the same. It lasts a few seconds (10 sometimes!).

So I doubt there's anything to do, unless this happens very often to you, in which case I'd take it to an Apple Store for either reinstall or some hardware check.