Docker: Occasional ping packet loss

Troubleshooting
3

I also set up a completely new cmk container. Same issues. Container is set up as:

docker run
  -d
  --name='checkmkk_empty'
  --net='eth0'
  --ip='192.168.178.29'
  -e TZ="Europe/Berlin"
  -e HOST_OS="Unraid"
  -e HOST_HOSTNAME="NAS"
  -e HOST_CONTAINERNAME="checkmkk_empty"
  -e 'CMK_SITE_ID'='l22'
  -l net.unraid.docker.managed=dockerman
  -v '/mnt/ssd/appdata/checkmk_empty/sites':'/omd/sites':'rw'
  -v '/etc/localtime':'/etc/localtime':'ro'
  -v '/mnt/ssd/appdata/checkmk/backup':'/backup':'rw'
  --mac-address 02:00:00:00:00:29
  --tmpfs /opt/omd/sites/l22/tmp:uid=1000,gid=1000 'checkmk/check-mk-cloud:2.2.0p23'

It seems to be an v6 issue only currently.

Does anyone observed similar things?