I've heard similar reports from the IT department at my employer as well. However, on my personal computer (and I've seen similar with a few friends), I've had to have the keyboard repaired 3 times. This makes me suspect there's something that aggravates the issue, or that a lot of people use external keyboards (which a glance around the office suggests is true). The majority of the keys that have failed on my computer have been in the areas that get hot when the processor is under load.