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1b1ed1a
(Get the code!)
I can confirm that this bug affects my Dell XPS 13 Haswell with an Intel 7260 rev 6b. Symptoms are identical to those described in the original post.
Using the mainline 3.15.10 kernel seems to have helped, but doesn't detect my Synaptics touchpad, so I never used it for very long. I also tried one of the 3.17rc3, but that wouldn't even boot.
The only workable solution for now is using 3.13.0-35-generic with the -8 ucode moved out of the way so that it uses the -7. This makes the disconnects come hours apart instead of minutes apart.