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 as text into a 'REPLY' as opposed to 'QUICK REPLY'. The forum software will remove the MAC addresses for you (If you get an error - just click the 'post' button again).
Also, set up a 'Broadband Quality Monitor'. This will monitor the state of your connection and record any network dropouts etc - You can do this at ThinkBroadband (https://www.thinkbroadband.com/broadband/monitoring/quality) Give it a while to gather data and then click 'Share Live graph' and paste the 'Direct Link' into the forum!
You have an upstream noise problem, evident in the data you posted earlier. On a good connection, the upstream has 4 channels working at 64 QAM (in simple terms think of QAM as a data rate). Your was showing two channels dropping to 32 QAM, and one to 16 QAM. When the upstream goes to pot, it affects latency and reliability, but often doesn't show up as an upload speed problem. It is possible that when Ashleigh_C looked earlier the upstream was performing well because these faults are often intermittent, but they could perhaps have spotted the evidence in the data you posted.
If the problem continues and there's no area fault then you need a technician visit to fix it.