This is still a problem I face. It did’t happen in a long time (1 month) and yesterday it happened 2 times again. I would be really interested what is going on. I want to be able to close my laptop, without worrying that the next time I open it, it reboots (with all my programs closed).
Maybe this issue has something to do with it: Frequent unexpected power-off with latest coreboot
I think I am not on the latest Coreboot.
PS: Still love my Librem