The newly released firmware that many expected to fix Surface Pro 3 Wi-Fi issue wasn't exactly getting it done. According to Microsoft's changelog, The System Firmware Update 7/8/2014 includes an update that improved system stability related to "Wireless network controller and Bluetooth" – However the wireless controller driver built was dated June 3rd, which means it was compiled before Surface Pro 3 shipped and most likely did not contain any fixes to the Wi-Fi issues that were found after it hits end-users.
Microsoft released a statement and promised a new update on July 16th that will resolve the Wi-Fi connectivity issues. The unstable connectivity on Surface Pro 3 has been bugging many users that rely mostly on 802.11ac and 802.11n protocols; however some also reported issues with 802.11b and 802.11g as well.
We found the Surface Pro 3 to be a very capable machine; and like many new tech products, it takes time to get things patched up. However Microsoft has not been very upfront with the Wi-Fi issues, but hopefully things would change in the future and patches get released quicker when it comes to fixing essential functions like Wi-Fi connectivity.