Updated to Kindle 3.0.2 and experimented with hot sun reading this afternoon (indoors, full sun, 80 degrees outdoors) and read with my graphite Kindle for 30 minutes. No noticeable lagging in page turns noticed! My machine with 3.0.1 and similar conditions began serious lagging after only about five minutes a few days ago. Problem solved?
Software update now at:
http://www.amazon.com/gp/help/custom...deId=200529700