This issue goes away when I reset the adapter. The whole network can't be accessed even the routers hompage when I use a VPN like Private Internet Access or CyberGhost VPN.
It happens particularly with TP-LINK N750 router. I tried it with Dlink but it works well. I contacted tplink and they said its a driver problem. It seems this adapter has some weird bug with Atheros routers.
Have you updated the firmware version of the TP-Link router? You may check on their web site for updated versions
http://www.tp-link.com/en/support/download/?model=TL-WDR4300&version=V1# tbl_j TL-WDR4300 - Welcome to TP-LINK
What is the version of the driver that yo are using for the Intel(R) N1030? And what is the operating system being used?
One thing I see is that the problem might be a compatibility problem if its working properly with the Dlink router.