Freezing when using 2 zgemma at the same time

[bluegashead]

When I'm using 2 zgemmas at the same time both on ethernet cables they start to freeze, as soon as I disconnect one of them the one still connected works fine. One of them on virgin and one on Sky. Can anyone help me with this, it my modem not strong enough? I'm on VM
Thanks

 

[Pale-Rider]

The obvious first step would be to check they both don't have the same MAC or IP address.

 

[bluegashead]

Can a mod delete this thread please sorry my mistake I thought it had been deleted and started another one. My apologies