Having problems with the mesh at home lately, since a month or so with some products losing connection to my wifi mesh, two amazon fire tvs lose connection and its is very difficult to get them in the mesh again. Also a windows 11 computer sometimes refuses to connect to the wifi or connects but says No Internet while the rest of my products have internet without problems (some 45 other)

I have been using the tpLink M9s for some years now without major problems, but since a month or so these lost connection is giving me headaches. I tried to erase the whole mesh, and reset all 4 M9s and the only M5 I have to factory and start again from ground up to no avail, they behave the same way...

please help