@CInderellafx 

Hi, thanks for posting question here.

It is suggested to follow this guide to troubleshoot.

Note: This steps belowneeds to be taken whent the issue happens, to test via your wired PC instead of rebooting the router directly.

"Disconnecting the TP-Link router from the modem (the piece of hardware supplied by your Internet company), then only connect your computer to the modem directly. If your computer cannot get a stable connection from your modem, it indicates the issue is on your modem or Internet Service."

If you need further suggestions, please share your exact network topology and ISP.

BTW,does the unstable issue happen on all your devices? When did you purchase the router and when did the issue start happening?

It is also suggested to contact local technical support for direct help.