r/HiveHeating

Hi - my Hive Nano 2 Hub has dropped connection to wifi and will not re-connect. I have unplugged from power and it still doesn't work. I have pressed the small black re-set button on the back of the Hub next to the power cable. It says a light will flash blue but I don't get a blue light even after holding it down for 20 secs. Any ideas? Is it a fault with teh Hub or maybe a fault with ethernet cable? Any ideas would be great.