I’m not 100% sure if my story below is related, but I experienced a quite similar symptoms as mentioned in this thread. Unfortunately, these symptoms were not very reproducible, so I will write here from my memory.
I experienced since the update to the 6.6 kernel series, a couple of weeks ago regular hangs, and created this issue for that: Regular hangs of L5 (#495) · Issues · Librem5 / linux · GitLab. Also I had often issues in booting up the Librem 5. For example the screen sometimes stayed black, sometimes I could enter the LUKS password, but the Librem 5 did not continue booting. They green led was sometimes on when this happened.
I even created this forum thread to try to get some info from other Librem 5 users regarding the instability: Stability, oopses, and traces of the Librem 5 - statistics and details
After the latest kernel updates, a few days ago (the same one as you referred to), I could not boot anymore at all as well.
To investigate the issue further, I booted with Jumpdrive, see also: Trying to use Jumpdrive: Possible eMMC defect
After I mounted the Librem 5 with Jumpdrive (on Fedora Linux) I could unlock the LUKS partition without any problems. I ran fsck on the file systems and noted that the boot partition had quite some errors. I let fsck fix them, but the Librem 5 still did not boot after this.
Then I decided to do a full reflash, following roughly these instructions:
- Building uuu and Jumpdrive · Wiki · Librem5 / Librem 5 Community Wiki · GitLab
- Updated today , now phone won't turn on/start up - #22 by joao.azevedo
After that, the Librem 5 booted perfectly.
But, I still have sometimes the half hangs, and difficulty booting the Librem 5. It seems to be in a weird state then. My guess is also that the file system corruption may have been caused by forcefully powering down the Librem 5, by long pressing the power button, or removing the battery.