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NguyenDuy, there are some possible causes for your issue:
- Interference by other wireless devices. Intel� Wi-Fi Products; Possible interference by other wireless devices may impact 802.11n performance
- You may want to use the compatible driver for Windows* 8.1. https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23258
- Hardware or integration issue. Please contact your system manufacturer.