Yes, my Vega 56s do the same thing with fast algo. Still no explanation as to why.
IDK neither because its the same code as V7, only that it uses half the iterations as normalV7.
Everything else is same.
Have you tried what i suggested earlier to use 112/16/2 ?
That actually fixed it for 2 of my rigs. The rest had a couple/few cards improve but still had like 1-2 cards dropping off. I'm contempt with that. Thanks for the suggestion, gave me a nice little hashrate bump!