Intel Corporation Wireless-N 7260 card dies randomly

You need to disable the power management and possibly the 802.11n extension. These changes worked for me.

For the power management create a file in

sudo gedit /etc/pm/power.d/wireless

with the following content

#!/bin/sh 
/sbin/iwconfig wlan0 power off

and make it executable:

sudo chmod +x /etc/pm/power.d/wireless

To disable the 11n extension, try the following

sudo su
echo "options iwlwifi 11n_disable=1" >> /etc/modprobe.d/iwlwifi.conf

You need to reboot after those changes. Running iwconfig should show:

wlan0     IEEE 802.11abg

and

Power Management:off

What definitely worked for me was to upgrade to one of the latest kernel from

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-rc4-utopic/

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