Mac book conflict

[#1]

I have a macbook conflict with my new plusnet fibre. The macbook freezes all the time unless I turn the IPV6 off on the airport advanced setting. Can anyone help or let me know an IPV6 address I can add manually

[#2]

It's cropped up before https://community.plus.net/forum/index.php/topic,140288.msg1237520.html#msg1237520

[#3]

When I first got the new 2704n router/modem from plusnet I noticed an iPad had gained an address from the router although my network was set static to a separate subnet, it turns out that the iPad had grabbed an Ipv6 address from the router. You can turn off the Ipv6 server if needed here >> 192.168.1.254/expert_user.html