Can you try to disable power management?
You can turn power management off with the following command:
$ iwconfig wlan0 power off
To disable power management at boot time so that it’s always disabled, you’d need to create a service with the script found on section 9.3 from the Wi-Fi guide, which can be found here http://www.intel.com/content/www/us/en/support/boards-and-kits/000005916.html .
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