Hey, the speed should be 30MB/s not 30mb/s per your description, which is about 240mbp/s; regarding to the router, the speed on writing on SSD disk is normal.

Agreed, my TP-Link device works properly as expected.

Once you logged into the web interface, you can go to basic-network map page to check the clients, or go to DHCP client lists to view them. For the Tether app, you can check whether your device...

hi, you may buy a new power supply with same specs or contact tech support to check whether you can buy one from them. https://www.tp-link.com/en/support/contact-technical-support/#Hotline-Support

cause other devices work properly with the wifi adapter, it should be fine. How do you connect the windows 10 laptop to the wifi adapter? By cable or wifi? With the powerline adapters and main router...

it is nonsense that the router will back to work once you connect your phone to the wifi; instead it seems that the router takes longer time than usual to reboot. when it happened again, try to wait...