Sometime around upgrading to 17.01.4 I believe my LAN speed was downgraded. I really doubt the updated software did this but I will attempt to reinstall 17.01.2 to make sure.
Other than that any ideas as to the cause? Router failure?
Currently running WNDR3800.
My internet connection was ~120mbps down before this, now around ~80 max but to be honest this might be my ISP's fault so you can ignore that. The switch speed on the router is the important part.
Cable failure is unlikely because all 3 connected devices are gigabit LAN. (2 windows machines and a raspberry pi 3).