Reinstall the utility or unplug it and try again. You may also refer to the site below: http://www.tplink.com/en/article/?faqid=423

What is the operating system of your Toshiba laptop? You can remove the wireless profile and reconnect to the wireless network.

I think you need to check some information from your Internet service provider, such as the VPI/VCI, connection type, username and password. If any of them is incorrect, the modem cannot access the...

You may check if the ADSL line works fine. The modem should be synchronized at first. The ADSL light should be stable on.

Not so sure. :)But as search online , 5G is working on higher frequency which is more attenuated than 2.4G

from TP-LINK website, i found some newer firmware which solved some bugs, you can upgrade your router with new firmware to have a try,...