It sounds like your browser is redirecting. Most browsers have options to prevent a redirect. Google "stop browser redirects" for you specific browser and see if that does the trick. Also look for a...

I cannot load the .js file as I get a 501 error. I can open just 192.168.0.1 and get my log on page for my Archer C8.

https://static.tp-link.com/7106507059_TL-WR940N(EU)&(US)_V6_QuickInstallationGuide.pdf and https://www.tp-link.com/us/user-guides/TL-WR940N_V6/#ug-sub-title-1 If you still have an issue, post exactly...

The "like this" link is not working. Try cut and paste in your message. Not sure what you mean by changed background color. The tether app is limited in what it can do, which is both good and bad....

Try the 30-30-30 reset and if possible reenter your all your settings. If that does not work, I would replace it.

Try a new cable as a bad cable can be an issue sometimes.