I disabled hibernation and have been leaving it plugged in, but this changes nothing. I suspect a faulty intel me since there is nothing else I can think of. The strange thing is I did not use me cleaner but used the full me extracted from the original bios. Later I downloaded the stock chrombook bios for my model from google and extracted the me module from that. 

At this point I have built several variations of roms using the me module from the original bios, the google bios, and "cleaned" versions of both but always with the same problem of power off after 30 min.

I am confused as to what the problem may be. I used the intelmetool bundled with coreboot but when I run it with the -s flag it seg faults.

In order to extract the me rom I used ifdtool that is included with coreboot.

./ifdtool -x bios.bin 

The intel me module is found at offset 00001000 - 001fffff and is 2 mb in size. Is that the correct way to do it? 

Any suggestions would be appreciated.