Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Defective merchandise

Very shortly after receiving the blanket and installing it on my bed it started having problems. It went from my setting of 12 to a setting of 6 with an E (error) message, and the blanket cooled way down. It did this on 3 consequtive nights when I finally realized there was a potentially unsafe problem and had to returned the blanket. Unfortunately, no replacements were available, so I purchased the same blanket from another source.