Instruct: Classify Amazon reviews into positive or negative sentiment
Query: quality no longer evidenced-sticking keys a trend?

Have previously purchased three HP 12C calculators over the years. The third one developed a problem with the #3 sticking and then becoming unresponsive. Purchased a forth and found immediately that the decimal key must be held for several seconds to have a chance of working.The first two HP 12C are over 15 years old and work perfectly so the quality in producing these calculators seems to have greatly diminished.Will not purchase another.