[PVE-User] Proxmox - CT problem

[lord_Niedzwiedz]

         Hi,
I have a debian-9-turnkey-symfony_15.0-1_amd64 container.
Which worked half a year well.
Now, every now and then, the mysql disappears into me.
How is this possible ?
I do not touch or change anything.
Any auto updates inside?
The idea of what this may be caused.
After restoring the base version, everything is ok, for a day, two and 
again it sits  ;-/

Linux walls 4.15.18-4-pve #1 SMP PVE 4.15.18-23 (Thu, 30 Aug 2018 
13:04:08 +0200) x86_64
You have mail.
root at walls ~# /etc/init.d/mysql restart
[....] Restarting mysql (via systemctl): mysql.serviceFailed to restart 
mysql.service: Unit mysql.service not found.
  failed!
root at walls ~# service mysqld restart
Failed to restart mysqld.service: Unit mysqld.service not found.