Can you post your Hub status and logs? Someone should be spot if there is a problem Navigate to http://192.168.0.1 (or http://192.168.100.1 - if in modem mode) Don't log in! Click on 'router status' Copy/paste the data from each of the tabs. The forum software will remove the MAC addresses for you (you may need to click the 'post' button again).
Sorry to hear of the broadband issues experienced, it's not the level of service we aim to provide. We appreciate you taking the time to raise this via the forums.
From looking at your equipment and connection we aren't ale to see anything unusual that might explain the problems, all of the spec's and ranges are as we'd expect. This is based off of the connection since your last reboot which was very recent.
Has the issue stabalised since your post or reboot? If not are you experiencing the issues over a wired or wireless connection? We have these tips available to help with broadband issues: