Blinking ‘brush’ led before finishing – Indesit D41

In my Indesit D41 dishwasher a ‘brush’ led (second from left – there are four leds in total) blinks before the dishwasher finishes the washing – the process does not finish correctly – it starts blinking in a time when the dishwasher shall start steaming/drying the dishes (when i open the dishwasher the washes seem quite clean but not 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d}). What the hell could be the problem here? The process stops when the led blinks and does not want to finish correctly – the blinking can go forever. It does not appear always but lately it appears more and more ofter.