I wonder if that's in relation to the 7 vs 8 variant of the Linux driver. I understand that when 22.24.8.0 was released, some issues forced Ubuntu to pull the 8 series out and put in the older 7 series (which is something like 21.x.7.0). As of recently, it's claimed that the 8 series was fixed, however I still had issues on a fully updated Ubuntu 14.04.1 system running 22.24.8.0. I updated the bug report with my comments urging the developers that this is still a problem. For kicks, I installed the latest stable Linux kernel, 3.15, and I see my driver version was bumped to 23.214.9.0. Even still, I had issues disconnecting.
At this point I'm going to just let Dell handle this, which unfortunately means that I'll have to do a system swap, but it'll land me on a different XPS 13 that does not have these problematic wireless issues. Unfortunately, the 7260 is the only card listed as compatible with the XPS 13 9333, so I can't even swap out to a different card. I can either keep this and tolerate its issues, or I can live happily ever after with a different XPS 13 that is not crippled by this poor excuse for a wireless card.
I've been a huge fan of Intel wireless. On both Linux and Windows, it's just been a nice 'safe' zone in recent years. Certain issues have risen up in the past (I recall an awful one from 2008/2009 that was in our Lenovo R61's), but we got through it. This experience has proven to me that you can't just look at the spec sheet, see Intel, and think it's a good buy. A simple Google search of 7260 yields a monumental amount of reason to avoid this card if at all possible.
Intel - Up until now, you've done some excellent work. What happened? How has a year passed with no actual fix?