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ubuntu not waking up after suspend

lv flag

We have around 250 Lenovo ThinkCentre M90n-1 devices on which we have set suspend mode on for the night, and WakeSystem=true for the morning, triggered by the system timer. The issue is that we have around random 2 devices per week not waking up from the suspend mode. M90n-1 I would like to have your suggestions about how to solve this problem.

Lenovo ThinkCentre M90n-1 4GB RAM (Swap = 2GB) uname -a output Linux 5.15.0-69-generic #76~20.04.1-Ubuntu

Our wake up service is as follows.

cat auto-resume.timer [Unit] Description=Automatically resume on a schedule

[Timer] OnCalendar=--* 07:00:00 WakeSystem=true

The screen appears on the screen during pc wake-up, but after a short while it hangs-freeze and no action can be taken, but it is fixed by turning the pc off and on. The relevant syslog record is as follows.

Apr  6 02:03:35 3000000123 nm-dispatcher[36654]: run-parts: failed to stat component /etc/network/if-post-down.d/avahi-daemon: No such file or directory Apr  6 02:03:35 3000000123 systemd[1]: Reached target Sleep. Apr  6 02:03:35 3000000123 systemd[1]: Starting Record successful boot for GRUB... Apr  6 02:03:35 3000000123 systemd[1]: Starting Suspend... Apr  6 02:03:35 3000000123 systemd-sleep[36659]: Suspending system... Apr  6 02:03:35 3000000123 systemd[1]: grub-common.service: Succeeded. Apr  6 02:03:35 3000000123 kernel: [115451.065577] PM: suspend entry (deep) Apr  6 02:03:35 3000000123 systemd[1]: Finished Record successful boot for GRUB. ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^ @^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ Apr  6 09:22:36 3000000123 systemd-modules-load[639]: Inserted module 'lp' Apr  6 09:22:36 3000000123 systemd-modules-load[639]: Inserted module 'ppdev' Apr  6 09:22:36 3000000123 systemd-modules-load[639]: Inserted module 'parport_pc' Apr  6 09:22:36 3000000123 systemd-modules-load[639]: Inserted module 'msr' Apr  6 09:22:36 3000000123 lvm[631]:   2 logical volume(s) in volume group "vgubuntu" monitored

I would like to have your suggestions about how to solve this problem. Thank you

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