Thanks for the post! I am sorry to hear about your issues with your broadband being off and on. I apologise for any troubles incurred.
I have tested things from here and I couldn't see anything out of the ordinary, no errors or time outs inside the Hubs logs and all of the power levels are within the preferred ranges.
Are you still having these issues? If so, please include a recent copy of your Hubs logs in your response for me to compare with the data we have here. You can find these by opening your internet browser and typing 192.168.0.1 into the address bar, before logging in it will say 'Router Status' in the top right corner, click there and all the information needed is inside.
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