Top Sport was fined €15,000 (£12,913/$16,017) after the Authority found that bets were being automatically placed on the operator’s betting app.
According to the Authority, after placing bets on a live roulette table supplied by Ezugi, once the player had locked their phone, the app automatically repeated the bet.
Following an investigation, the Authority said this was in breach of Article 16, Parts 4 and 5 of the Law on Gambling in Lithuania as the game did not meet certain requirements.
Part 4 stipulates that every gaming device must comply with the requirements established and approved by the Authority.
Meanwhile, Part 5 states a gaming device and remote gaming device must have a certificate issued by accredited institutions, confirming they meet the requirements set by law.
Top Sport was also warned that further breaches, or failure to rectify the issue, could lead to its licence in Lithuania being suspended. The operator has until 1 July to comply.
All decisions made by the Authority are subject to appeal.
The latest ruling comes after the Authority this week also fined Top Sport another €25,000 for allowing underage individuals to enter one of its slot salons.
An investigation led by the Authority found that three people, at least one of which was a minor, were able to enter the facility and remained inside for more than two hours.
The Authority said Top Sport did not take any measures to remove the three people from its premises.