Krups EA 8808 - Coffee gets too strong

Hello all,

I have a Krups EA 8808 and after 3 years and 15,000 coffees, it no longer ran properly, so I started a Ruindumerneuerung: Brewing soup, water distributor, pump - all new.
The machine now runs in all modes, but I have the following problem:

After 2 - 3 coffees, the water comes out of the nozzle very slowly

.

The preparation takes a very long time until the cup is full. The coffee tastes then but almost like an espresso.
The amount of water is correct (cup gets full), but the pomace pucks are very dry and crumbly.

Thanks to the forum, I got into the service menu and reset the values for the "Brewing Function".
After that, the first two coffees run normally and taste fine, but the other coffees become too strong again and taste like espresso.

As if the Maschione would not save the setting of the coffee pomace thickness and then presses the ground coffee together more and more.

Auto test runs through successfully and shows no errors.
I have also done a calibration with a homemade wooden "cake tool" but the problem persists.

Can it be that here this potentiometer which measures the thickness of the pomace pucks is broken?