Aftermarket one. It's the new one capable of 1.7gbps. I use cat6 ethernet cable, and nat2Are you using a router that came with your ISP Package or a aftermarket one? or are you using some sort of Wired connection extender? and if you can would it be possible if you can find out what NAT Type you are using on the PS4?
I suspect it is an issue with that or you have a strange cable because Nat 2 is the best one for you. https://arris.secure.force.com/consumers/articles/General_FAQs/SBG7580-AC-Troubleshooting-Intermittent-Wired-Connections/?l=en_US&fs=RelatedArticle Have a look at this and get back to me. Maybe check if the router needs an update.It's the arris surfboard model number SBG7580-AC