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?