so I have received my sierra but at least once or twice a day it zombies 
and doesn't kick back in until I restart cgminer
does anyone know why this happens?
Are you overclocking it (too much)? and doesn't kick back in until I restart cgminer does anyone know why this happens?
clock 590, current hashrate of 1.22TH/s, temp 77'c 0.79v
and i have to restart cgminer twice, first time it just hangs then second time it kicks in straight away