Tchibo Esperto Caffè grinder runs repeatedly

Dear coffee lovers,

I have a "Tchibo Esperto Caffè" fully automatic machine, which has been working well so far. For a few weeks now, the warning for the coffee grounds container has not been working as usual.
Despite the container being full, the "Empty coffee grounds" display no longer appears.
In addition, no coffee is brewed in this case, but the grinding process keeps restarting until the machine is switched off by Hsnd.
Once the overfilled container has been emptied, the machine can be used again as usual.

Is there possibly a sensor in the machine that monitors the fill level or is it just a simple counting mechanism?

I have already opened the machine a few times to clean the grinder and would be confident enough to repair the potential sensor myself.
Looking forward to any helpful tips!