arty, regarding your answers:
4b) WPA2-PSK -> If you remove encryption entirely, or adjust it to 
WPA-PSK/TKIP, WEP does it change anything?
4d) No QoS AFAIK -> So, in your router, what options do you have?
4f) I didn't enable any firewall on the router -> Does your router have an 
option to disable this?
4g) The problem has happened on several channels. -> Which ones specifically? 
Did you try them all?
5) At least 4 other WiFi devices do not have problems like this one. -> What 
devices/OSes specifically?
9) I have never tried that with previous releases. I do not have the option to 
try. -> One may test prior releases (live environment is fine) via 
http://releases.ubuntu.com/ . Saucy would be helpful as it tests the next 
oldest firmware version for your chipset.
10) Since I have already tried the latest 3.19-rc1 kernel, I don't see the 
point to test compat-wireless -> compat-wireless has the commits from 
linux-next in them, which is more advanced than 3.19-rc1 (linux-stable). Could 
you please advise to this?
13) I will try the ndiswrapper later. -> Please advise to this as it working 
rules out hardware failure.
16) I'm using linux-firmware 1.138. I haven't tried the previous version. 
Latest Intel firmware is from 3/25/2014, I assume it's already included in 
linux-firmware 1.138. -> It's not. I've adjusted the article to better inform 
on this.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1405437

Title:
  [Dell Precision M4800] iwlwifi regularly loses connection on Intel
  7260

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