X1C all of the four AMS slots blinking "red" - no Print possible

The Printer showed messages like “Filament is running out” and “have a look to the Printhead” - but all AMS slots are full of Filament and no broken Filament in the nossle or Printhead.
And all the AMS LEDs blinking “red”. All Filaments out and in again, but blinking still “red”.
What does it mean? What can I do?

Der Drucker meldet “fehlendes Filament” und “Druckkopf beobachten”. Aber alle 4 Rollen im AMS sind voll. Und keine Filamentreste feststellbar. Und alle vier AMS LEDs blinken rot. Trotz Filament raus, rein,raus. Was kann man tun?

LG Roscano

Have you tried to unplug and plug the data cable? This has happen to me twice. Once was a faulty cable, the other was poorly seated connector.

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What do you mean by “data cable”? Is it the “power”-cord? Or the cable from Printer to AMS? Both of them I have unplugged and connected again. Still red all 4 LEDs. Messages on the screen like “Filament out” and “unfill Filament from the single Roll” , but I have only that AMS, no single. And alle the 4 AMS slots are filled. So what can I do?

This are the Messages I got:

Type of Filament unknown:

Filament Parameters will not accept:

Filament is running out:

Printhead clear?

an still “red”