I recently bought a MBA and bought the HDMI-out cable on the side for my momma when she wants to watch movies from the web. Plugged it in today and fired it up. When the movie was about almost through, I came by to check on things and noticed the MBA was pretty warm/hot. The movie was running off flash so most likely why, but with extended use, lets say every other weekend, does the MBA performance degrade over time compared to just regular use?