Please Help im am at a loss and have no idea what to do next.

Ive been in touch with both Virgin (internet provider) and TP link support who are at a loss.

Ive used TP links for 3 years with absolutely no issues. I moved house 6 months ago and took the links with me. 

I have the main adapter (TL-PA4010) linked into the modem and an wifi extender (TL-WPA4220) in the summer house. Another extender wired connected to the CCTV hardrive (TL-PA4010) and another extender wired connected to a computer desk top (TL-PA4010).

All have worked perfectly fine for the 6 months i have been here. About a week ago i notice a couple of times the TP link in the summer house going down. It seemed to sort itself out so no issues. Then few days ago it went down completly. I can see the TP-Link visible and lets me connect on all my devices but i get no service through them. I did some troubleshooting myself.

- Wifi is fine and at 200 mbps is strong

- I can use the wifi

Therefore i thought the issue would be the main adapter so i went and purchased another starter kit. I plugged in the new main adapter and new extender and the same thing happens. I can connect to the TP link but it doesnt work. Therefore ive had Virgin send me another modem as i thought that could be the issue and that hasnt resolved the issue either.

Therefore ive come to the conclusion that either i am the most unluckiest person in the world and purchased a brand new broken TP link to replace an exisiting broken TP link or its something else?

Any advice would be greatly appreciated