You may be getting interference from some other wireless device or from someone else WIFI. Other devices may be interfering with the radio signal. Things like cordless phones, wireless security cameras, anything wireless that uses the 2.4 or 5 bands. Other WIFIs may be flooding the channel your WIFI is using. Each location will have its own best channel and that can vary from time to time. I have a iMac and it has tools (although somewhat hidden) that allow me to see the other nearby SSIDs and the bands/channels they are using. There are WIFI scanners that you can install for Windows machines. I have my router channels set to Auto which works okay for me. Selecting a specific channel may be needed if something is interfering with channel the router selected to use.

I found a faq guided users to do troubleshooting regarding to the unstable connection issue: https://www.tp-link.com/en/faq-2238.html

You can contact their tech support to get a specific answer as well.