at a tangent [so to speak] what network issues and why is it though changing the hub will help - it may but if the new hub was offered when you rung in its likely the agent took the easy option - change the hub and hope and get rid of the caller
if thats the case nothing will change when you put the new hub on line
so whilst you wait you could look for help with the problem - a description of said problem and some info on the input
log into hub3 - 192.168.0.1 [or 192.168.100.1 if in modem mode] - DON'T SIGN IN, click - click router status [centre of screen] - and post the downstream and upstream figures - to see those press on the grey buttons/boxes labelled - upstream - downstream
if its an earlier hub button is top right
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Tony