Every time I go on Destiny I get a warning about my NAT being strict, but on my console it says the NAT is open.
This has only been happening since I got fibre.
There are 2 consoles in my house, but happens when just one is on.
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This is a internet provider issue, the reasons will be the change in router for the fibre optic, if this has caused not serious issues it can just be left but you can try port forwarding which will be explained on your internet providers website, not always a miracle cure.