My wife and I have both K2 and K3. This past week, read every day in the sun on vacation and never an issue. My graphite does get slightly warm, but not hot. Hers is white and does not get warm. We read on and off for 5 hours a day for a week. and no issue in the hot Florida sun. We even got rained on, and the K3 got wet. Wiped it with a towel and not an issue. In fact, We are on our second week without charging.
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