Things can turn around quickly in the NBA. In the final minute of the third quarter, Cade Cunningham hit a 3-pointer for a two-point lead, and the Pistons looked to be on their way to another thrilling finish against the Boston Celtics. That is, until the Pistons went cold from the field. The Pistons went most of the fourth quarter without a field goal, finally ending the drought when Saddiq Bey made a driving lay-in with 30.3 seconds remaining. The Celtics cruised in the final period and took a 114-103 win on Friday night at TD Garden. Cunningham finished with 27 points, eight rebounds and si…