I found a very interesting observation on one of my starter kits. One of my five h-cards shows it has a dead chip in slot a-1. If I move it to slot b-1 or c-3 that h card now shows all chips working for that problematic h-card.
I've seen something along those lines - slot A (3rd slot on 3rd bank) on my v2 m-board generates lots of miso errors regardless of the card I put in it. I can tune the card and get some of the miso-errors to go away by shutting down chips, but the errors don't happen on the same card if I move it to a different slot or a different m-board
/cet