If more COB's start blinking as you power up my best guess is a lack of current to drive everything. As the demand goes up any digital components are starved out and shut down, then the current comes back, and the voltage comes up and the digital stuff comes back to life. Then once again the current is sucked out again shutting it all down over and over. If I had to make a guess as to what there problem is it would be a lack of current from the power supply. They should beef it up I think. Of course it could be the solder joints like the other guy said, but usually that would make a line shut down, or not get as bright. Sorry to hear of such bad support out of these guys making good lights on the cheap. I would bet a better power supply would have cost them a few bucks more per unit.