with the hub changing colour as you describe it is really a connection issue and not a wifi issue
try quiet line test dial 17070 option 2 should be silent and best with corded phone
are you connected to test socket with filter to eliminate any internal wiring as being a problem
If you like a post, or want to say thanks for a helpful answer, please click on the Ratings 'Thumbs up' on left hand side. If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.