Setting different TOS could help according to [Solved] Time does not sync on Pi 3 and with official dongle - Raspberry Pi Forums
That points to some firmware/driver defect in RPI3 (it seems unable to forward IP packets with ToS != 0).
But kernel module is disabled and you can't test that.
I think LE guys should ask RPi guys if this is still and issue. Or someone should make you appropriate image to test. Or just use USB wifi stick 
chewitt : ^^^^
Well, I newer saw this issue in real life. So someone else would need to step in to help you.
As already figure out: you don't get NTP response packets 
No idea what is causing this. I assume it must be something on your modem/router in case wifi is used.
Try setting date/time with the help of timeapi.herokuapp.com as I suggested. Until you figure out the reason for your problem.
It is network tools.
In one terminal run
tcpdump -vvnAs0 -i any port 123and in another
ntpd -d -d -d -n -p pool.ntp.orgCopy result from tcpdump to Pastebin.com
Post url for command
iptables -L -n | pastebinitI think you should install system tools addon and capture network traffic to see what is going on.
Did something changed regarding CEC in LE9?
With 2 years of development? I would say yes 
Why Coreelec, Alexelec have Python 3? Only you cannot use Python 3? why?
They have Python2 as default Python and extra Python3.
As you can see you don't get any response back from NTP server (which listen on port UDP 123). Routing table seems fine. Are you using some firewall? Does any other network action works like curl?
curl http://libreelec.tvAs a temporary workaround you could set time like this (from autostart.sh maybe periodically):
date -s @$(curl -s 'http://timeapi.herokuapp.com/utc/now?\s')Ok, it was just a try.
What about
ntpd -d -d -d -n -p pool.ntp.orgAlso can you run this and post url?
route -n | pastebinitSeems your network is just not ready yet.
What about adding this 2 lines at start of file Autostart.sh [LibreELEC.wiki]
sleep 5
systemctl restart connman.serviceIf it doesn't work try use longer sleep (in seconds).
Post log.
Check ffmpeg-tools addon.
In vdr-plugin-xineliboutput package add pre_configure_target function and use ./configure.
pre_configure_target() {
cd $PKG_BUILD
rm -rf .$TARGET_NAME
}I think only cgroup_memory=1 should be enough.
I'm doing something wrong?
Why is not working?
No idea. Don' have any RPi to test that.
thoradia: thanks. Not familiar with RPi boot files that's why I wrote "or wherever boot parameters are set" 
Ok, try adding cgroup_enable=cpuset cgroup_enable=memory cgroup_memory=1 to /flash/config.txt (or wherever boot parameters are set). Reboot and check systemctl status of kodi or whatever service.
