Hub one makes werid noise and speed dropped dramatically

[#1]

Received my hub one a few weeks ago and at first it was great, I received the speed I was guaranteed, around 68mb.

then a week ago the speed has dropped down to 10-20mb and the router is making a high pitch noise. 

Any ideas? Surely this isn't normal. 

[#2]

If the weird noise occurs when the router is in use it's probably the 5GHZ channel it has a tendency to make this noise.

James

[#3]

If you can raise this here we can get this looked into.