heavy + smart auto blinking lights - Change part and problem still not fixed

Hi ! A few times in last months our dishwasher stopped working, with heavy and smart auto lights blinking. At first, we could restart the cycle and it was ok but recently it would not start.

We found information about this code saying I needed to change the part DD94-01006A. A technician also came to our house and as soon as he saw the error happening, he said the problem was this part. We changed it, but the problem is still there. First time we tried after reparation (and times before), the cycle would stop after a few seconds and we could see the water going over the sensor. We tried again and this time the cycle went on and we though it was ok, but the code came back and cycle stopped later.

Do you have any idea what could be wrong ? I can’t believe after 3 years I already have problems (had some with my oven too). We are trying to fix it ourselves, parts are really overpriced when buying from samsung authorized center, but we don’t know what to do anymore. Thanks ! (And sorry for my english :wink: )