Suggest you grab the hub's status data for Downstream, Upstream, and Network Log, and post here as text, we can take a look for obvious problems. I'd also recommend you set up a Broadband Quality Monitor, and post the link to shared live graph. That won't show much useful for the first 24 hours, but once there a good set of data we can see what the connection looks like over time.
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Have you checked the 'Check Service Status' at the top of the page ?
If nothing is showing try phoning 0800 561 0061, this will tell you of more local issues that may be affecting your district. Be aware that it isn't a manned line.
Go round all the accessible internal and external co-ax connections and ensure that they are finger tight.
If everything above is OK we need do some more troubleshooting; to start with …
Can you please
Type 192.168.0.1 (192.168.100.1 in Modem mode) into your browser URL bar and press enter.
Hub 2 & 3 When the page appears DO NOT LOG IN but click ‘Check Router Status’.
Hub 4 When the page appears LOG IN then click ‘Check Router Status’.
Copy and paste the contents of the Downstream, Upstream, Configuration and Network Log tabs onto here, if you get a yellow / straw box warning click the Post button again. Use one post for each tab if you wish.