Internet Connection fails upon startup (and from sleep)

I've brought a brand new iMac a week ago and continue to have problems with the internet. I have a very fast and stable connection from a homehub (wireless).
This is what it looks like when I go to diagnostics when the internet fails:
Green - Wi-Fi
Green - Wi-Fi Settings
Green - Network Settings
Orange (sometimes Red) - ISP
Orange - Internet
Orange - Server
From 'Network Diagnostics' I click on the continue get to the "select network stage" and then it says that "your internet connection appears to be working correctly" - I have to do this every time to 'wake-up' the internet!
I just wondered if it was something that I have to keep doing or if it's a problem which can be resolved.
Thank you!

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Internet Connection fails upon startup (and from sleep)

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