Now that's what I call a quick answer! 2 minutes :-)
I'm on Marlin build 2 since october 2011. Did quite some good prints with it untill this problem showed up in februari.
I'm pretty sure it's not gcode related. I tried the same gcode three times to get it third time right. On the first two tries I had the temperature drop problem, third time was OK.
Can it be a temperature issue on the motherboard controller? Don't know how to check that but my motherboard fan is rather noisy which may result in bad cooling for the components on the board (?)
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Daid 306
First step would be to check if the temperature adjustment isn't in the GCode. Check for M104 and M109 commands (these set the temperature)
Second, which firmware are you running? The stock 5D firmware?
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