you are on s2idle, even though you have available deep sleep, and that could be the reason for your issue…
so change it to deep:
kate /etc/default/grub
and inside this line: GRUB_CMDLINE_LINUX_DEFAULT inside the quotes add this parameter:
mem_sleep_default=deep
dont remove anything, just add it to existing parameters; save the file, update grub:
sudo update-grub
reboot and test
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