It seems like there are a few different issues described here, so I don't know if this would address all of them, but I had very bad WiFi drop-out on my new Samsung ATIV Book 6, and was about to return the computer, but found a review on Amazon (of all places!) describing how to disable the Intel driver (using the default Windows driver instead). This has worked amazingly well for me, and many of the reviewers on Amazon, as well.
See the "dissed" user's full review at Amazon.com: Samsung ATIV Book 6 15.6-Inch Full HD Touchscreen Laptop (Mineral Ash Black): Computers & Accessories for more details.