Try removing the NAT network using the following:
Get-NetNat | Remove-NetNat
You can also try restarting HNS and docker
Restart-Service hns
Restart-Service docker
Unable to Remove Container Network
Try removing the NAT network using the following:
Get-NetNat | Remove-NetNat
You can also try restarting HNS and docker
Restart-Service hns
Restart-Service docker