Mine started this night.
I was shooting an event and the Multiview just turned off. Changed the monitor and HDMI cable, no luck. It stayed off until I stopped the KiPro we use. After that (more or less) it came back and started flickering.
In August 2011, Blackmagic changed my 1M/E because of this problem. It was continously flickering, turning on and off. They sent me a new unit and it never turned off again until this night. I mean 5 months it worked ike a charm. I am running 2.8 software version. May it be due to software version? Somebody uses 3.0 beta and experiencing the same problem?