They didn't look interested until halfway through the third quarter. By then they were 22 points down, and that is tough sledding against a playoff team like Miami.
Someone posted a stat on Twitter saying the past 2 or 3 weeks the Piston's defense has ranked 20th in that time. Defense is what determines if this team wins or loses. Their offense isn't good enough to be a team that wins consistently while playing that poorly on defense.