I would think it would be a heat issue, since it only happens in the sunlight, but the problem didn't exist with the original firmware for me - just the 3.01.
I dunno. My only thought (which is just a wild guess) is maybe they set the CPU speed a little faster and thus it now it prone to overheating more? I believe sometimes the CPU is set to run lower than it actually can, because it saves energy that way.
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