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For the issue about the rPi shutting down, are you powering the rPi off a USB hub or do you have a stand-alone 5v1a source for it?

If you are powering it off of a hub, I would suggest using a stand-alone power source. (Apple USB chargers work great, as they are 5v 1a.)
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I'm using a standalone 5v1A powersource.

And this morning the Raspi has rebooted again and this time I'm getting a CGminer failed to load error.