Molten SATA power connector on a mining rig.

I have a mining rig with 8 GTX 1060 3GB connected via risers, the risers are connected via SATA power connectors to Corsair HX850. When the rig stopped working I noticed that one SATA connector on the PSU is molten:

I made the rig work by replacing the cable and risers with new ones but did not figure out what exactly caused this. Also it is not clear is there a limitation on how many risers can be connected to the same SATA cable. Originally there were 6 risers on this cable, now there are 4 or 2.

Before that there was some molten cable on some other KCASS PSU that was found to be faulty by the vendor:

so in this case I got the money back.

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