Every day or so my speeds will drop from about 200Mb/20Mb to about 70Mb/20Mb and get stuck. The only way I have found to fix this is to reboot the Hub.
I also have an issue where the admin page becomes inaccessible while in modem mode, as it is currently. I can fix this temporarily by factory resetting the Hub, performing the initial setup and then re-activating modem mode. I can then access the admin page at 192.168.100.1. Eventually this will stop working and attempting to access the admin page will return a "connection has timed out" error in the browser. This happens on both Wi-Fi and Ethernet and even sequential rebooting does not fix it.
Another issue I am having is what can best be described as sporadic bursts of micro-disconnections. The connection will disconnect for less than a second and immediately reconnect and then repeat for a while. This doesn't seem to have any adverse affect on real-time applications such as games (the game does not disconnect when the connection "drops"). This is still not intended behaviour though and is incredibly annoying. I have created a BQM which shows these disconnections as tiny amounts of packet loss (less than 1%).
I will factory reset the Hub if it is absolutely necessary in order to post the power stats etc., but it's quite inconvenient to do so.
As you are on the 200 service - how did you get the Hub4 - was it a new install or offered as an "improvement" over your previous Hub? If so, what was that Hub model and were you having problems with it? If not - do you still have it?
-------------------- John --------------------
My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.