I woke up this morning to find my miner doing nothing , and showing a red LED. I restarted and it mines , but it's getting fewer Gh. I looked at the cgminer config page and it looks like one of the units is out (match_work_count14 ). What could cause the red light and sudden stopping of one of the units?
The red led indicates a power supply problem.
I would guess the most likely problem to be a capacitor failed on the one miner section and shutdown the psu.
There's several pictures and reports of cap failures throughout the thread.
Hard to predict if it will shutdown the psu again or not but if it did I would consider removing the power connections on the bad miner section.