Yes.
I switched all the raisers and cables and even put the graphic card directly on the motherboard PCI slot, same instability.
The only thing I did not do was to rewrite HiveOS image, seemed a bit overkill to me since I have latest updates and NVidia drivers (510.73.05)
I kept the core clock as high as possible (1300) while lowering the memory OC to 800.
I also adopted version 42.2 with arguments “lhr-mode”: “2”, they claim it solves some instability issues.
It has been running stable for 22 minutes so far…