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Delonghi Magnifica ESAM 4200.S Ex:1 grinding too much coffee

Hi, 
My coffee machine started to grinding way too much coffee. The extra amount of grinding coffee it build up and block the funnel on top of the infuser. At the next attempt, the funnel being full, the grinded coffee will come out on top of the machine. 
I have open and clean the grinder, all the inside of the machine, replace the (front) Control Board PC with no result. 
Any idea what can it be the problem? 
Thank you.