Funny you mention this today - the exact same thing happened with my empeg. I ran the RAM test several times - it was okay at 38 (as reported by the test routine), and started failing at 44. At this temperature, it failed every time, but always at different places.
TNT is going to pick the unit up tomorrow for a warranty repair.
Daniel
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"My software never has bugs. It just develops random features."
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"I love deadlines. I love the WHOOSHing noise they make as they go by." - Douglas Adams