http://www.tp-link.in/support/contact/?categoryid=530

The laptop is the only client connecting to the Wi-Fi network? Hard to say it is a router problem or laptop issue. As the router is not yours, it is not suggested to upgrade the firmware or change...

Your PC and powerline adapter are plugged in power sockets which are near to each other? Is it possible for you power on your PC with power extension cord (better with surge protector function) while...

The IP address is invalid and that's why you cannot access internet... As I mentioned above, try to reset them and repair them. If it is the same, connect your PC directly to the router and check IP...

Do you have a power socket or a power extension cord with Surge Protector feature?

Intel AC7260 is not working properly with many brands of router... The latest driver won't fix the problem? https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProdId=3714 Disable U-PSD...