Customer service from TP-Link is a joke. 
 

I have emailed you - no reply

i have called helpline - no answer 

tweeted you - got asked to DM

DM'd you - no reply 

I've had 5 chats online but no one says anything other than replace main deco with slave and reset. 
 

Absolute joke of a company. 
 

everyone has the same issue, devices get a cant access internet message even though connected to WiFi. Everyone knows it's your terrible firmware. 
 

I can still return my deco P9's because they came from amazon. 
 

Look at the 1* reviews they have on trustpilot. 
 

if you are thinking of buying from TP-Link don't. If you can return any products you have for a refund, absolutely do.