Just had a shut down of the miner a bit ago. This raspi image i'm using might not be ideal.
More details please
Which RasPi image are you using?
There is a known error with misc's Scripta image. Apparently 'slub_debug=FP has to be on the first line'
https://litecointalk.org/index.php?topic=9908.300Have you tried Worldly's RasPi image?