I have 3 P9 connected via lan cable through switch and x20 acts a main deco, All deco unit are operational under router mode. The problem I'm facing when my phones are locked I get delayed internet based notification on my phone tablets and PC. The first one minute everything works fine but after that 1 minute it's like my phone has disconnected from wifi and I have to wake up my phone to get those missed  notification even though I can see the wifi is still connected to it . I did get help from tp link they suggested me to changed the dns to Google but that didn't work. I just want to know if anyone has witnessed similar problem