[effemmeffe]

My logs:
kodi.log: http://paste.ubuntu.com/p/Zn2hVfX2yh/

My system:
fmf@kodi:~$ uname -a
Linux kodi 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Ubuntu is running on a Intel NUC DN2820FYKH with a Celeron N2830 and Intel HD Graphics connected via HDMI to my Samsung TV.
The NUC is used as a media player and as a server for some services.

Kodi version: 18.0 installed via PPA
fmf@kodi:~$ apt policy kodi
kodi:
  Installed: 2:18.0+git20190128.1934-final-0bionic


I run kodi as a service:
fmf@kodi:~$ cat /etc/systemd/system/kodi.service
[Unit]
Description=Kodi standalone
After=systemd-user-sessions.service network-online.target sound.target mysqld.service
Requires=network-online.target
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[Service]
User=kodi
Group=kodi
PAMName=login
TTYPath=/dev/tty1
ExecStart = /usr/bin/xinit /usr/bin/dbus-launch --exit-with-session /usr/bin/kodi-standalone -- :0 -nolisten tcp vt1
Restart=always
RestartSec = 5
StandardInput=tty

[Install]
WantedBy=multi-user.target

At boot kodi starts and I can see the GUI and use the media player.
But if I switch off the TV and leave kodi idle for a while, I can't figure out how much, when I switch the TV on again I get a message that there is no signal on the HDMI.
I can ssh to the server and it is running, to see the kodi GUI again I have to restart the kodi.service with systemctl command.
Is there some change I can do to my system to avoid the GUI to disappear?