I'd encountered this one, it happens when I connect the 3 RX480 GPUs to the motherboard, seems that the wire couldn't cope up powering up the 3 GPU's from the mainboard. I am now using powered riser to avoid that.
Yes that makes sense but it is still strange that it's been working for the last 3 months without any problems...
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it was not working it was failing in slow motion.
you were most likely 100.5% of the max load on those particular wires in the 24 pin cable
when you do that you get fails in months 2-4.
been there done that.
lower clocks.
don't dual mine
use only powered risers
a little of all of the above.