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hallo,

sorry for writing this in english. reading German is ok but writing is a pain in the ass

I had the same problem with my G 10 years ago.
It is the drain that is blocked.
I used a iron cloth hanger, cut it to make a long iron stick.
I tried to find the drain from under the G and stick the drain carefully in the drain.
I think that those are rubber drains so you have to watch out not to brake the drain.
In my case it fixed my problem.

good luck