@Trancey Good day, 

Sorry for the late update and thank you for your post. Do you mean all the powerline devices lost Internet every morning and unplug and plug back in the main adapter , they will work again? you try the following suggestions:

1.  Please connect a computer directly to the main router by cable and confirm the router is stable. 

2. For multiple (>2) powerline units of the same model number, please test 2 at a time, switch locations for them and see whether issue happens on a specific unit /location.

3. Turn off Power-saving mode on powerline devices：
 https://www.tp-link.com/support/faq/2018/
4. Put powerline units into the same room and test stability
 

If the above does not help,

Please test the AV2000 extender with a computer, and when there is no Internet (do not need reboot powerline adapter at this time),  check the IPv4 address and gateway on that computer  and share us a photo

https://www.tp-link.com/support/faq/838/

Ping the default gateway at that time and send us the ping results：https://www.tp-link.com/support/faq/838/

Please let us know the Model of your router, and your network topology if possible, thank you very much