I'm on a gig package using the smart hub 4 in modem mode with an asus ax86u router. For the last couple days my internet speeds have plummeted to sub 1mbps speeds. I can't even connect to steam atm as my speed is terrible and uplay gives me dl speeds in kbps. Before this I was getting full gig speeds on wifi and wired.
I've done a factory reset on both my router and the hub and did tests on the hub in router mode using a cat5 and cat6 ethernet cable. Sam knows shows 500-600 in the speed department but if I use any other speed test service I get 1-2mbps tops (except 1 server on speedtest which oddly enough is decent speed but 10 other servers are bad, see pics below).