I have a Vivid 100 account but am not getting anywhere near 100 Mbps.
With anti-virus and Malwarebytes Premium switched off, running Cat5e Ethernet cables I'm only getting a little above half the speed I'd expect. My connection has never been up there near the top end of what I'm promised but I used to be able to nudge 68 to 75 Mbps sometimes.
I have a 'Super Hub' if that makes any difference.,
Sorry to hear that you're having issues with your broadband speed, would you mind going to: https://192.168.0.1 and click on router status and take a screenshot of the downstream/upstream power level pages?