From time to time i lost my network connection on the host but the container have already a good connection. It seems that some conflicts occur between the host and the container.
I need to do the following to retrieve my host connection :

$ sudo ip link set enp2s0 nomaster

after this command i have the connection on the host but not on the container. To revers :

$ sudo ip link set enp2s0 master lxc-nat

So,it's a little annoying....