I just bought a surface pro 4 i5/256gb. My router is RT‑AC68U and all my device worked very well with it on 5GHz band. However, my SP4 gives me a very poor signal range, in about 7m away from the router, I would lose all signal. While at such range all my other devices work well with almost full signal on 5GHz, my phone, my ipad, my MacBook. Is anyone else experiencing such issue? Is this just how well the Marvell adapter can do? So far I am seriously considering returning it, as so far this device is showing much more problem than any other computer I owned, poor wifi, sleep to death, randomly lose touch, randomly lose keyboard touchpad, even my self assembled one functions better.