On the C1s, if I reboot (GUI) they do not come back up cleanly, you have to reset the power switch. When I say they don't come back up cleanly, I mean the hash rate does not return to the 1000GH/s. Maybe 760 GH/s. Often times the ASICs on chain #2 or chain #3 hashing boards come up all --s or ..s
That appears to be how these boards like their power and like a hard reboot to reinitialise. It may be firmware but its more likely to be a characteristic of the boards themselves.