http://www.intel.com/support/wireless/wlan/sb/CS-034315.htm
^^^ See this link re: driver numbering.
Farther down the page of the forum is a thread about the same issue. "AC7260 disconnects every 5 minutes." --Same problem and likely a similar solution for you.
Here: 7260AC disconnecting every 5 minutes
See that one and try the driver that is linked there. If you don't understand something about the discussion there, ask away. What really matters is the driver. Most have been stinkers since the early 16s up until 17.12. Also, uninstall ProSet in Control Panel.