I am having this problem as well since upgrading to Windows 8.1 and now i can't roll back to microsoft 14.8.8.75 driver.
I tried to manually install the 14.8.8.75 driver from windows 8 into windows 8.1, but is unable to do so due to unsigned driver.
Why is it the Microsoft 14.8.8.75 driver is able to work in windows 8 but the Intel driver keeps dropping connection?
I hope Intel is aware and doing something about this problem.