Issue Lot of errors when doing Plesk update

[Khorne]

Hi,

since several months, I have lot of errors each time I update Plesk. Beside updates, I have no problem.

Here are some examples of errors I get during each update

----------------------------------------------------------------------
WARNING!
Some problems are found during attempt to start service mariadb - control script doesn't exist or isn't executable(see log file: /var/log/plesk/psa_service.log)

Continue...

Failed to get properties: Connection timed out


Failed to get properties: Connection timed out
Starting sw-engine (via systemctl): Failed to start sw-engine.service: Connection timed out
[FAILED]

unknown
Failed to get properties: Connection timed out
Starting sw-cp-server (via systemctl): Failed to start sw-cp-server.service: Connection timed out
[FAILED]

Trying to start service drwebd... Failed to list unit files: Connection timed out
Failed to list unit files: Connection timed out
unknown

----------------------------------------------------------------------------

When I'm lucky the update get finished (even with all these errors), when I'm not lucky, I need to restart my server for everything to get back in order (until then next updates).

For information, I'm on CentOS Linux 7.2.1511 with 12.5.30 Update #32

Now I'm afraid to update it to the last version because of all these errors.