@David-TP replaced a few other cables, restarted my tplink 105e switches, disabled mesh for most of the components and now it seems to work. I have the firmware: 1.2.7 Build 20240719 Rel. 66567...

Having lots of problem with my pair of X90 bought January 2022. Worked fine the first two years and prior to the current problems it has been working ok'ish for some month. Now it is dropping...