I’m a bit curious how you have 64GB of RAM working when the official specs say only up to 48GB are supported, and whether the official limit is artificially lower than it should be, or if using 64GB is getting into the realm of weird edge case behaviour that may cause intermittent failures like this.
–edit: found sort of an answer to myself.. this was asked about back in april, and it was noted that while there is at least one person running a 64GB stick in their FW12, neither Framework nor Intel have validated this, so they can’t speak to compatibility