I’m having the same issue. I’m running a librem 15v3 with reflashed coreboot and Qubes OS 4.0.
The freezes occur sometimes during boot-up when Grub asks me for a passphrase (and right then the system freezes, so I can’t type any keys) and sometimes when I’m running the OS and doing my normal work the system just suddenly freezes.
I would like to give you more info, but currently my system is hung up in the issue described at Librem 15 won’t turn on.
I’m using coreboot version 4.7-Purism-4 as well. This suggests that it might not be a debian (or PureOS) specific issue.
I also still get this issue also after specifying intel_pstate=disable to the kernel args via the grub menu.
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