Trackpad usually works, but sometimes stops responding for around 5 seconds and then suddenly starts working again. Seems to happen when I switch between typing and moving + button-clicking and also when I do a lot of double-clicking. Tried turning off the "Ignore accidental trackpad input". Apple replaced the keyboard/mouse under warranty. Problem remains. Any ideas?
White non-unibody Late-2008 13" MacBook - fully up-to-date OS. Doesn't seem to matter if it is plugged in or not. Updated to Snow Leopard - seems to have made it worse.