Try taking your S5-371 to a coffee shop or a friends house. How does it work then on their wireless router?
Have you tested it with a different wireless router?
Check out the Acer article below.
http://acer.custhelp.com/app/answers/detail/a_id/32747#_ga=1.114890823.1157921757.1473448280
Make sure you reset the TP-Link to factory defaults and use the TP-Link default settings when you're testing.
You can also check out the TP Link forum
http://forum.tp-link.com/showthread.php?84840-New-Archer-C7-v2-is-dropping-internet-daily
http://forum.tp-link.com/forumdisplay.php?38-Dual-Band-Wireless-Routers
If you've altered/tinkered with network settings on your computer, you made need to reset your PC to factory condition and just start over.
