I have successfully talked dell technical support into sending me a replacement Intel wireless card. You guys should probably try the same if you're comfortable replacing it yourselves, if not, they will e mail you a shipping label and you can send back your xps 13 and they will replace killer with an intel card. People who replaced killer with intel 8265 report that all wi-fi issues are gone.
Hi I just received my new Dell XPS, i7 12gig Ram 9360 and I have the following issues.  The wifi connection is very poor in that i need to be near the router for it to connect. All my other devices such as a win7 laptop, phone, android tablet and smart tv all connect to my router with no issues whatsoever. I can use my mobile as a hot spot and it connects perfectly with the laptop. When the laptop connects its very slow and occasionally drops out.  In addition, the screen flickers off and back on again randomly for a couple of seconds!  Searching on the web and forums these are issues with the last model? I would have thought these would be fixed in the new 9360  As far as I can see all the drivers are up to date for the Killerwifi and laptop.  Im really happy with the product but for a amount paid it should be working out the box! Please can someone suggest some fixes? I am tempted to do a windows reset!  Many thanks  
Dell XPS 13 9360 - Wifi dropping out (or not connecting) and screen flickering