With only a single LED flashing, it looks like maybe the MCU has rebooted.
The LEDs are numbered 1 (closest to USB connector) to 8 (closest to the PCI-E power connector). Is it LED 7 that is blinking?
Yes this board reboots(7 blinking)... But some just drops 1 V rail to 0 V and start producing HW errors and hashing blinking speeds up... But this board is now hashing at 41GH... But if I turn it off it will probably stop working again... I need to restart it enough times and it works again... But if it reboots it reboots at 0.97V and 27GH... After about 200 shares...