You get a Microsoft* inbox driver for Windows* 8; however, this is not confirmed in Windows* 8.1 but you may contact Microsoft* in this regard. Intel® only supports this wireless adapter in Windows* 7 and older operating systems. Please read the articles below.
I had the same issue on my old Laptop HP 9xxxx.
Strange enaugh, the problem appeared only after one month I installed Windows 8.1 from scratch.
I noticed the issue disappearing when not using the wireless, although the driver was still loaded.
I tried to install the latest Windows 8.1 driver from here: http://www.intel.com/support/wireless/wtech/proset-ws/sb/CS-034038.htm but the device manager keep showing the "old" Microsoft one.
Eventually I installed the Windows 7 64 bit one (14.3.1): http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=21049
Now device manager shows the new version. So far so good, the problem seems gone.
I hope this helps.