Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works great when it works

I received this player for my b-day a year ago. Starting about 6 months ago, it has stopped reading some discs if there were scratches on the disc (the discs could be read by 3 computer DVD drives worth a third of the money). It seems to have gotten pickier as time has gone by. When it does work, the picture and sound quality are great, but that is only about 60% of the time right now.