Mine is Thinkpad E440 with Windows 8.1 and Intel Wireless N 7260 having disconnect and limited connection issue.
Yesterday i realized that Wifi driver from intel is released with version 17.0.2.5 which is in the update description is fixed the disconnection issues.
I reinstall my Laptop with Windows 8.1 and install the latest driver for Wifi to 17.0.2.5 from Lenovo site and my problem is solved! I have posted many questions in Intel and Lenovo forums and finally Intel and Lenovo support solved this problem.
I got 2 days stable connection after fresh install of Windows 8.1 with the latest driver and hopefully for the future. Will keep you posted.
Thanks!
OH! Very Thanx!!! I have solve same problem on Lenovo Flex 15 IdealPad with Windows 8.1 x64 by reinstalling LATEST (17.0.2.5) version of Intel Wireless N 7260 driver! Thank you alot!