@Gii 

There are some circumstances that Tapo smart devices do not work stably or lose connection from time to time, this could be due to the network environment or some other reasons, here are some helpful tips to fix the situation:
    1. Ensure Router is working properly. Try to restore the connection by rebooting both router and smart devices.
    2. Update the firmware of the Tapo device and ensure Tapo APP is up to date in the APP store or Google Play.
    3. Ensure Tapo smart device is receiving a Good Wi-Fi signal, you may move the device closer to the access point or the router, keep the smart device away from microwave ovens and other interference sources.
    4. Turn off Advanced Wi-Fi settings on your router like Band Steering (also called 'Smart Connect' or 'Whole-Home Wi-Fi'), Wi-Fi Optimizing or 'Channel optimization' etc.

Here is a detailed instruction for you: What should I do if my Tapo smart devices keep losing connection or going Offline?