Low wifi speeds for one device on Xfinity gateway -- Microsoft Surface

I have one device on my gateway wifi that always has very low speeds and I'm hoping someone has a suggestion.

The device is a Microsoft Surface and no matter where I place it relative to the gatway I never get speeds of more than 5Mbps, normally in the 0.5 - 1.5 range (as tested by Googles internet speed test). All of the other devices on the network give speeds as expected, 200+ Mbps. 

I have moved the Surface to within 1 foot of the gateway and that gave me a bump to 7 Mbps.

I have taken the Surface to other location (office, coffee shop) and get the speeds I expect. This is a work computer and I have had it checked by our IT department and they could not duplicate the issue, I am convinced it is an issue that only shows up on my home network. 

Any thoughts?