The DRS system suffered another foot trip at University Oval on Sunday.
New Zealand batsman Tom Latham had a reprieve on 97 after Sri Lanka had referred a not out decision from English umpire Richard Kettleborough. They believed the ball had struck Latham's pad before he swept it for two.
Third official Paul Reiffel didn't have access to all possible angles and said he had no reason to overturn Kettleborough's original decision.
As it happened, Latham had edged the ball, but hands were tied by protocol. On Saturday, Latham's team mate Doug Bracewell was rightly given out lbw at the tail end of New Zealand's first innings.
Bracewell tried a referral, but Reiffel could not rule as his television monitor was not working.