P9 device intermittent connectivity issues
I purchased a set of three Deco P9's on the 19th of Feb. I installed them on the 5th March and since then have had the same recurring issue. Devices, particularly but not limited to iphones, intermittently can't access the internet. Switching off WiFi and turning it back on again will rectify but in can happen every few minutes or every few hours. WiFi signal still shows as there, decos display solid white light, just no access to the internet. Connecting devices back to the ISP router network and no issues, so it is something to do with the Decos. I have checked it's upto date, swapped slave decos for main ones, factory reset, put in access mode, put ISP router on static IP, restarted everything lots of times and nothing works.
There are other posts on this forum with people having exactly the same issue, so it's unlikely a fault with hardware.
TP-Link, what is the issue? How can it be fixed?