Random connectivity issues after enabling ipv6 for the internal network

[szaimen]

Apparently Docker has still some issues with ipv6.

I found this which explains some random dns resolution issues that appear from time to time after enabling ipv6:
moby/moby#41651

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You should be able to fix this by so:

1. Stop your containers from the AIO interface
2. After the docker daemon started correctly run sudo docker network disconnect nextcloud-aio nextcloud-aio-mastercontainer to disconnect the mastercontainer from the nextcloud-aio network.
3. now remove the nextcoud-aio network by running sudo docker network rm nextcloud-aio
4. Then run sudo docker network create --driver bridge nextcloud-aio in order to recreate the nextcloud-aio network
5. Finally run sudo docker network connect nextcloud-aio nextcloud-aio-mastercontainer to connect the mastercontainer to the network again.
6. run sudo docker restart nextcloud-aio-mastercontainer
7. At last, open the AIO interface and start your containers again