SXR80 satellites both have lost connection, re-adding is not possible with strange behaviour

I have already created a ticket for this, but maybe someone on the forum can also advise.
This is what I have sent to Netgear:

Today out of the blue I had no internet anymore on many of my devices.
After checking, the satellites were displaying solid magenta.
Trying to re-synch did not work.
When I go close to the router I can get wifi on my laptop and some devices.
Wired connections are working and internet access is working.

I tried resetting all satellites and router to factory standard.
I renamed my network the same as before and try to synch the satellites again really close to the router.
Satellites both become blue in the process for a little while and go to solid magenta after that and stay this way.
Both satellites display the same behaviour so I am guessing problem with the router.

Tried the proces again with a utp connection between router and satellite.
Satellite goes to solid magenta again, however it show up in the router settings with IP address 192.168.1.250 which I can ping.
If I access the page by browser it shows me all the connection devices (wired and wireless) from the router itself, which makes no sense since nothing is connected. After removing the utp and restarting the satellite, solid amber, solid blue, solid amber and again to solid magenta in a 2 minute period. Then it goes back to blue again for a few minutes, then back to blinking white, back to amber, back to blue and back again to solid magenta.

There is not really a pattern to be found in this behaviour.
From time to time, my wifi connection (when sitting next to the router) just drops.
Reboot helps most of the times, sometimes it just comes back...