Having recently purchased a Surface Pro as an alternative device to my IPad, and experiencing the working / not working Surface Pro WiFi, I am very disappointed with my latest purchase. No such problems with my IPad – a great product.
One trend I have noticed is, as a general rule, my Surface Pro does not work at night, yet without altering my network, or cycling the modem, or moving to a different location, the next morning my Surface Pro connects without any difficulty or delay. Looking at this issue in more detail, at night, unlike my IPad, the Surface Pro detects approximately 10 to 12 nearby modems, although in every case, with the exception of my own modem, the signal strengths are very weak. However, in the morning the number of modems detected drops to about 6 to 7. I am beginning to suspect that the problem is a WiFi interference issue. Interestingly, my IPad only appears to detect between 1 to 3 modems, regardless of the time of day. Given my limited knowledge of modems, and not wanting to spoil my IPad experience, I am not keen to mess with my router settings, but I have noticed that band is set to automatic.
Hopefully MS will find the solution that so many Surface Pro owners need, and need sooner than later. In the meantime I cannot recommend the Surface Pro.
My experience is the exact opposite of yours. I would suggest returning your SP immediately. It is obviously defective. My SP's Wi-Fi massively outperforms my iPad 3's