Intermittent Wi-Fi Connection On Laptop

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Have you experienced dropping wi-fi connection on your laptop? This problem has just made me scratching my head for a while. All of a sudden, my connection is suddenly disconnecting from the internet, although the router is just  3  meters away from me and other devices, like the apple TV and the iPad seem like not affected with the problem. So it is obvious that the laptop is the problem.

Ruling out the problem

• What puzzles me is when I run the connection trouble shooting button(right click the signal icon, then click troubleshoot problems), it comes up with a DNS error, which in my opinion is not the case because the other devices can access the internet without the problem. 

• Checking the firewall did not show an obvious exclusion or blocked internet content, and the setting of blocked content is the same for every device because this is set at my ISP's. So if a device can go to a certain site, there should be no problem for other connected gadgets using the same wi-fi access.

• I've also tried to forget all remembered wi-fi access by right clicking the same signal button > open network and sharing>Manage wireless network>right clicking and removing (1)the access in question and reconnecting them again to no avail.

• Or it could be the wi-fi hardware of the laptop? If this is the case then I am convinced I have to buy another laptop or be contented to connect it with wire. As I am thinking about the inconvenience of wires and the tight budget I am experiencing at the moment, my wandering led me to the power options (right clicking the battery>power options) 

which is set to the recommended setting(balanced).

 I changed it to high performance and like magic, the wi-fi soreness is treated. No more DNS error, and dropping internet connection.