I think I catch the error. Modifications from LUCI are not writed to the hwclock of the Turris Omnia. If I set the system date via LUCI and then write it via commandline “hwclock -w” to the hwclock, the clock is persitent after reboot.
BTW: I use the Turris Omnia in a special usecase, mostly without internet access and so NTP is no solution for me…
I think i have the same clock problem , my TO has only LTE connectivity, somehow the standart ntp functionality doesn’t seem to work for me, now i’m using cron with ntpdate i think.