Surface Pro 3 wifi connection "limited"

I am having a strange issue with my Surface Pro 3 connecting to wireless networks and I'm not 100% sure whats behind it. It seems to be some sort of strange compatibility issue with the Surface Pro 3 and BT HomeHub 5's?

A summary of the issue is as follows:
When I connect my Surface Pro 3 to my home network it initially works, the time varies (between 2 - 20 minutes). Then the connection becomes "limited". Restarting the router/the surface doesn't resolve the issue and some of the other devices connected to the network also see to struggle to connect to the network after this has happened (please note, that none of the other devices have any issues on the network until I try to connect the surface, then everything goes wrong).

My surface pro 3 works perfectly well on my work's wifi which isn't a BT HomeHub 5, but it has the exact same issue when I connect to my parents network which is a BT HomeHub 5.
BT sent me a replacement HH5 for my home network, but again the issue persists.

I spoke to microsoft via chat and uninstalled my network adapter and let it reinstall automatically. This didn't help the issue.

I notice a similar issue was brought up here: http://answers.microsoft.com/en-us/surface/forum/surfpro3-surfnetwork/limited-connectivity-wifi-surface-pro-3/299f5ee8-e490-47a7-87a3-2a770eed7028?page=1

I don't know if they got anywhere with their issue, but it sounds like it's the same as mine.

Also, its probably important to note: This surface pro is my 3rd replacement after I smashed the screen on my first, had to send the 2nd back as its chassis was warped. This issue didn't appear to happen with either of those 2 surface pro's.

Any help with this issue would be greatly appreciated.