Thanks.
Yesterday I checked without M2X. The behavior is similar.
I also tested it on a custom build of DaveMF - Поддержка русскоязычных пользователей - #407 by ElDrako
With it, the board falls asleep for the first time by pressing the power button and wakes up, but the second time after going to sleep it freezes and you can turn it on only with the reset button.
Last lines in logout before freezing:
[ 363.057037@4] Retrying again to check for CPU kill
[ 363.057040@4] CPU1 killed.
[ 363.101268@5] nvme0n1: detected capacity change from 128035676160 to 0