Like I posted, Kernel panic - linux box with 2 GPUS, I just did the steps in that thread and the problem was solved. To this day there’s never been an issue.
I looked through my old emails and didn’t find anything extra to help… only a brief correspondence with Vitor Balasco Serrao from Jeff Lee’s lab who had the same exact computer as us and experienced the issue before we did, and solved it in the same way.