Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Messy after a year or so

It was working fine but after a year or so of using it, the soybean mixture began to burst out from the vent. It's during one of the grinding phases and the bursts of grinding sending the mixture out through the vent like Mount St. Helen. After the eruption, the whole pot is wasted and leaving a messy kitchen for me to clean up...