broadband speed dropping

[DarrenPaul]

ive got 900mbps sky broadband and have a Q 2tb and a mini box .

Both boxes are hardwired to the router, but im only getting a speed of around 80mbps on my computer which is also hardwired to the router.

But when i disconnect the mini box my computer gets around 900mbps

So the mini box is taking far to much broadband speed,

Is there anything i can do to keep the mini box connected with the hardwire and get better speeds to my computer ?

 Thank you for any help