I have been using five (!) Deco P9 since a year or two but have been struggled with a seriously unstable wifi experience ever since. Latest firmware, moving them around, install/uninstall, set up ever

My three Deco P9 WiFi is terrible, if I am lucky it last 3 hours before I need to reset the router. I have 100mbit fiber and it is working, Deco is not. Latest firmware. I have tried to use just one o