Is anyone else getting half their advertised speed when using a third party router on Vodafones HFC network? I tried connecting directly to the modem and can get the full 100mb/sec, but with the router (WRT 1900AC) i can only get 50 (via ethernet). 

There weren't any firmware updates or configuration changes before it started happening (about a month ago) and it is happening to multiple households in our neighbourhood (they get 20 instead of 50, but get full speed when connected directly).