after reboot card is not present anymore

[0d0a]

found a solution in the forum, flatmax please change your setup instructions and think about adding this solution!
add this text to /etc/modprobe.d/audioinjector-octo.conf :
softdep snd_soc_audioinjector_octo_soundcard pre: shd_soc_cs42xx8 snd_soc_cs42xx8_i2c

See message from richardash 1981 in Octo fails to register with current 4.19.15 kernel

Note:
this happens also in ubuntu-mate for raspberrypi3 (32bits)
solution is the same!