Well maybe it DID finish flashing, HOWEVER, upon restarting I can not access the gui at all.
The web browser never registered a response from the unit so the page showed "flashing" even after the unit had restarted itself (and stopped working).
Rare problems occurring seem to be what happens to me. Wish there was a way to re set it. Holding that reset button does nothing.
It will not be a consolation, but the cause is maybe that you started doing something BEFORE the previous process finished.
You need to RMA the unit. Contact Bitmain warranty if this is a November miner. Warranty is 90 days.