Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Sony GDM-500

Have had the monitor for 5 years. Excellent up to a month ago....after being on for 5 minutes, blurry to the point where text is unreadable. For $2000 USD, I was hoping it would last longer....the issue I'm sure exists with the 520 model....GR, Windsor, Ontario, Canada