I assume you have powered the router down and up. Have you added any new devices such as a weather station to your home that uses radio signals that may cause interference? Try moving the router a...

I think you should contact TP-Link support as they may have firmware that can send you. It may be a Beta version. I have a C8 and getting IPv6 to work took a lot of playing around to get the settings...

Another thought... Check your PCs for malware and such. Run Malwarebytes, CCleaner, your antivirus scans, device checker on your ethernet hardware connection. Also use a different browser. I had...

If bypassing the router works okay it would indicate it is the router. I would try the following: 1) Replace the cable between the modem and the router. 2) If heat is a suspect, move it away from...

Check the guest network controls. They have a schedule on my C8 settings.

A few shots in the dark. Is the setting for your WIFI channel Auto? Could it be that the assigned channel is getting overloaded? By disconnecting and reconnecting the internet cable change the...