Here are some actions that may help improve the connectivity of the wireless adapter:
1. Do a clean install of the most recent wireless driver. Make sure to uninstall and delete the previous driver before installing the new one.
You should be able to obtain the most recent driver from the http://www.intel.com/support/oems.htm PC Manufacturer, or you may get the generic 17.16.0 version from https://downloadcenter.intel.com/product/83635/Intel-Dual-Band-Wireless-AC-7265 Intel® Download Center.
2. Apply the configuration from the advisory: http://www.intel.com/support/wireless/sb/CS-030709.htm?wapkw=wifi+recommended+settings What are the Recommended Settings for 802.11n Connectivity?
* These settings also apply for Wireless AC.
3. Make sure your network is using a current Authentication Protocol, such as WPA2-AES. For testing purposes, you can try disabling authentication and test the connection again.
http://www.intel.com/support/wireless/sb/CS-025643.htm Data Rate Will Not Exceed 54 Mbps When WEP or TKIP Encryption is Configured
Let us know if this helps resolve the issue.