[server] Ubuntu 16.04 Sever freezes every day

Hi,
I'm having lots of trouble with a server running UBUNTU Server 16.04. It freezes in a daily basis, mostly at night, when there are not users connected or processes running.

I don't have any clue about what could be the cause. I've already run memtest (no errors detected) and can't find nothing relevant on logs (I guess someone with appropiate skills could find something).

When my headless server freezes, it can behave in different ways:

- No SSH access at all (it asks for user/pass but then doesn't respond)
- Samba is out. SSH works very slowly. Power off or reboot commands doesn't respond. Systemd process is consuming huge amount of CPU but Kill the process doesn't work. Sometimes (very rare) even file system turns read-only ¿¿??

Any advice about where could I look for some clues about what is happening would be appreciated.

Thanks!

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[server] Ubuntu 16.04 Sever freezes every day