Motorsport fans hoping to watch replays of Formula 1 qualifying were left out of luck over the weekend after on-demand content was deployed incorrectly to the new streaming platform.
Spark confirmed on the platform's Facebook page that issues also affected Formula 1's third practice session and the first Formula 2 race.
They said a review with the platform provider of last weekend's issues was being planned.
Spark Sport launched in March this year and held the broadcasting rights for the Rugby World Cup in September.
Gorilla Technology Chief Executive Paul Spain said the performance of Spark Sport "isn't that great," but added that it was "absolutely possible" for Spark to deliver a good result for the Rugby World Cup.
"Now it's really in Spark's hands to execute and to make sure they get that right," he said.
A Spark spokesperson said the team behind the service learned a huge amount since launching, "which should put us in good stead for the future."