I have many faulty groove's. But I found a way to fix 40% of the devices. When 2 lights are on all the time or the first four are on and the other two are kind of blinking. The solution is to remove the heat-sink. As funny as it sounds the heat-sink causes those problems. Of course you need the heat-sink otherwise it will over heat. The only problem is that how you will fix this problem permanently and why happens now and not when it's new.

I tried cleaning the termal paste and replacing it with a non-conductive termal paste. Even used a thick layer to ensure that the heat-sink doesn't make a short of some kind. They all still are faulty when I put back the heat-sink. The only semi-permanent solution I found is to remove the screw that is closest to the capacitor c32, if I tighten that screw the groove starts to fail.

Is this a know design problem? Or what else could it be? All the thermal pads/screws are ground so even if the heat-sink makes continuity, it shouldn't matter. The most posible problem it's a cracked solder point or component that when the heat-sink presses against the PCB causes it to fail open.