Check the location for heat issues. We were having a problem with out box shutting off and determined it was from a combination of the pantry and the afternoon sun hitting it directly and a wine fridge that was plugged in at the bottom of the pantry. Unplugged the wine fridge and it hasn't shut off since. Just a thought!
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...grateful for grace.....
Otto Braun 6/6/12-12/26/13
--cure pediatric cancer--