I did fresh installation few days ago.
Only couple of test sites are located on the server under admin + one customer.
I did the initial setup of the server and switched to php-fpm + I`ve changed Memory Limit from 64 to 256M.
I didn`t touch anything else! And again .. 2 days later without touching anything for more than 2 days the sites disappear...
If i run ./restart-all maybe everything will come to normal.
You can find attached the message log for reference.
I give up
UPDATE: 30min later without restarting anything or touching anything the sites appear and everything come to normal... Well obviously this is not normal behave...