Hello 10 days ago I bought a new TL-WA860RE V6 to use it as an extender to my main router which is TP-LINK Archer VR600v v2.

Ever since I connected the extender to my main router, the main router loses the connection to the internet, and after some minutes  the internet comes back again.

This happens several times every day.

The TL-WA860RE V6 had already the latest firmware but in case I reset it, downloaded again the latest version and reinstalled it.

I also updated the TP-LINK Archer VR600v v2 to the latest version but the problem still exists.

I unplugged the extender for 2 day and the was no internet drop.

I reconnected the extender back the connection button was green and 5min later the main router loses the connection to the internet.

I usually connect 1 device in the extender or nothing and the problem still occurs. 

I tried having the same name as the main router and even different name as (example)EXT for the extender but same problem.

Now this device is worthless because it makes my main router unusable too.