Even swapped out the Framework mainboard after a long back and forth with support. Just some poor battery unloading or similar causing shorts. I was very close to committing my company to using them until this started happening to my tester unit and my lead engineer's tester unit.
I hope the best for Framework -- I really love their repairability promise -- but before I can commit my company to them I need them to not be lemons.
How long in months was “really quickly”?
Try out Memtest86 - I think it's also usually an option in the boot menu on Ubuntu live-DVDs.
Let it run overnight, I've had crashes like that before where the RAM only starts failing after a few hours of memtesting.
I guess next step would be Memtest! Thanks for the reminder.