One more unhappy customer here. Like everyone, I am experiencing recurring WiFi drops. I purchased by Samsugn NP740U3E-A01UB (Series 7 Ultrabook) in May, which has the 6235. I also have the most updated drivers available on the Intel site (15.8, I believe). I can share more details if it is helpful, but so I don't see any difference between my situation and many others struggling with the 6235.
I don't have time to comb through all 41 (!!) pages in this thread, and even if I did it does not seem like any reasonable solution has been put forward. Fingers crossed something changes soon.